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Mistakes don’t really matter. Or so we like to tell ourselves.

But some actually do. Every now and then, someone manages to mess up so spectacularly that it changes the entire course of history. And while the results are sometimes catastrophic, others end up reshaping the world for the better.

Below are some of the most unforgettable moments where things didn’t go as planned and everything changed because of it.

#1

Fox Turned Over 'Star Wars' Rights To George Lucas

Star Wars logo in bold yellow outline on black background, symbolizing significant moments that changed history.

After the success of his film American Graffiti in 1973, George Lucas wrote an original space adventure that would later be called Star Wars. Lucas first approached Universal, but they declined the deal. Only one studio, Fox, agreed to produce and distribute the film. In his contract with Fox, Lucas negotiated for the merchandising rights and sequel control, to which Fox agreed. When Star Wars was released, it became one of the highest-grossing films in history, earning Lucas millions on merchandise, all while retaining full control over the sequels.

Mike Fleming Jr , KAMiKAZOW/Suzy Rice Report

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    #2

    Mao’s Great Leap Forward

    Large crowd gathers along street during a historic event symbolizing one of the biggest mistakes that changed history.

    The Great Leap Forward was an industrialization campaign launched from 1958 to 1962 by Mao Zedong, chairman of the Chinese Communist Party. People's communes were formed to ramp up grain production to support the industrialization of urban areas. Unfortunately, the quotas Mao demanded from the farmers in the people’s communes were just too high, leading to the farmers losing their lives to starvation to reach them. This caused the Great Chinese Famine, one of the largest famines in history, which claimed the lives of millions of people in mainland China.

    Wikipedia , Wikimedia Commons Report

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    TotallyNOTAFox
    Community Member
    1 month ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    "The war against sparrows" also led to an increased insect population, decreasing crop yields even more. Mao saw a sparrow eat grain and came to the wrong conclussion that eradicating them would lead to better harvests... though the main dish for sparrows are harmful insects

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    #3

    Nasa Ignores Challenger Warnings

    Space shuttle being transported on a road at a launch site, illustrating one of the biggest mistakes that changed history.

    The Space Shuttle Challenger was launched by NASA in 1986. It spent only 73 seconds in flight before exploding and leading to the tragic loss of all seven crew members. The cold weather on the day of the launch compromised the spacecraft’s rubber O-rings, causing it to explode. In the months leading up to the ill-fated launch, the SRB manufacturer and NASA managers ignored engineers’ warnings about the risks of launching in cold weather.

    Wikipedia , NASA Report

    #4

    Supreme Court's Citizens United Decision, Which Made Corporate Bribery Legal

    Three people with raised fists standing in front of a historic courthouse symbolizing biggest mistakes that changed history.

    On January 21, 2010, the Supreme Court ruled in favor of the Citizens United argument that barring unions and corporations from funding independent political advertising using their general treasury funds was in violation of the First Amendment's guarantee of free speech. The decision was immediately deemed historically important and was met with controversy. Some viewed it as a victory for freedom of speech, while others criticized it as an attempt to rewrite campaign finance laws.

    someSingleDad , Lara Jameson/pexels (not an actual photo) , Britanica Report

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    #5

    George W. Bush Invading Iraq In 2003

    Statue being toppled in a public square, representing one of the biggest mistakes that changed the course of history.

    The 2003 attack on Iraq by the US sparked an 8-year-long Iraq War, which ultimately gave rise to ISIS. American citizens were heavily divided, with some against the war and others for the war. In its bid to fight t*******m, the US arguably did the opposite.

    Wikipedia , U.S. military or Department of Defense Report

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    #6

    Giving Religions Tax Free Status

    Open book with a rosary placed inside, symbolizing one of the biggest mistakes that changed the course of history.

    Constantine the Great issued the Edict of Milan in 313 CE, which aimed at legalizing Christianity and granting tolerance to all religions. Support to the Christian churches by way of tax exemptions was also allowed. This tradition eventually became the norm in Western civilizations for years to come.

    VoiceGuyNextDoor , Pixabay/pexels (not an actual photo) , Britannica Report

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    April Pickett
    Community Member
    1 month ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    That's true. My opinion is that if Religions are entering the political landscape, their exempt status should be changed to taxable. All those donations to the church should not be spent on political candidates or political support of any kind. If you want to play in politics, you should pay your fair share to the government, since you are trying to change the government.

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    #7

    The Sale Of Alaska

    Historic 1865 US Treasury Warrant featuring intricate engravings, an example of biggest mistakes that changed history documents.

    Alaska may be a part of the United States today, but it wasn’t always. In 1867, Russia sold Alaska to the US in a deal that surprised many. The Sale of Alaska is remembered as a huge blunder on Russia’s part, due to the vast resources such as oil, gas, and gold found under Alaska’s melted ice.

    Wikipedia , Edouard de Stoeckl and William H. Seward Report

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    sofacushionfort
    Community Member
    1 month ago (edited) DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    They knew there was value in the interior of Alaska, but they also knew it couldn’t be defended in a war with British Canada, or controlled if a bunch of crazy Americans flooded in like they had Mexican Texas. The practical decision was to sell it.

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    #8

    A Rushed Public Announcement Brought The Berlin Wall Down

    Section of the Berlin Wall displayed outdoors as a historic example of biggest mistakes that changed history.

    In 1989, on November 9th, Günter Schabowski, an East German official, was tasked with announcing new travel regulations at a press conference. He wasn’t briefed on when they would take effect, and ended up stating they would take effect immediately instead of the following day. His further reiteration of this statement in an interview with Western media sparked a mass exodus to the Wall. Completely overwhelmed, border officials had no choice but to let people through with little to no identity checks. The misinformed announcement made by Schabowski ultimately led to the fall of the Berlin Wall and Germany reuniting in 1990.

    Wikipedia , Shreyas Joshi , IWM Report

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    TotallyNOTAFox
    Community Member
    1 month ago (edited) DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    And it wasn't even free travel, it was just easier access to visa in a shorter amount of time he was tasked to announce. He fumbled that so hard that he declared immediate free travel towards West-Germany instead, creating so much confusion that the GDR's government couldn't react fast enough

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    #9

    Alexander Fleming's Accidental Discovery Of Penicillin

    Close-up of a Penicillium mould sample from 1935, related to one of the biggest mistakes that changed the course of history.

    In 1928, after returning from a family vacation, Alexander Fleming discovered Penicillin. When clearing his Petri dishes containing Staphylococci, he came across one that had grown a type of mold that wiped-out all the Staphylococci around it. This mold turned out to be a rare strain of Penicillium notatum. Isolating it from the mold proved difficult for many years until professors at Oxford University managed to create Penicillin just in time to save lives in WWII.

    Wikipedia , Mrjohncummings , ACS Report

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    TotallyNOTAFox
    Community Member
    1 month ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    There are different types of Penicilin based on different strains - the WW2 medicine was Penecilin F. It wasn't the extraction that proved tricky, it was finding an effective type

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    #10

    Black Sabbath's Guitarist Lost His Fingertips In An Industrial Accident

    Man playing electric guitar on stage, representing some of the biggest mistakes that changed history’s course.

    Tony Iommi, the guitarist for Black Sabbath, lost two fingertips on his fretboard hand in a factory accident at 17 years old. Determined to keep playing the guitar, he made thimbles to protect his fingers. The thimbles made him press down on the strings more, producing a heavier sound. This heavy sound paved the way for the heavy metal genre.

    Wikipedia , Carl Lender Report

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    Billo66
    Community Member
    Premium
    1 month ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    Just stop. Im upset that he is that good with prosthetic fingertips. I'm a huge fan but dammit I sound like a chimp with a one string banjo.

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    #11

    The Chernobyl Explosion

    Chernobyl nuclear power plant, a historic mistake that changed the course of history, with workers and damaged reactor visible.

    The Chernobyl Explosion is one of history’s most devastating nuclear disasters, with an estimated cost of over $700 billion. Miscommunication and a lack of safety precautions at the plant ultimately led to the costly explosion that severely affected the lives of many.

    Wikipedia , Carl Montgomery Report

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    SomeGurlOnline
    Community Member
    1 month ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    That one scene in the HBO series where they explain it to the committee with the tiles is very well done. https://youtu.be/TmIEI4ky-Zc?si=vs4--NeTjMP0245G

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    #12

    The Tokyo Stock Exchange Typo

    JPX Tokyo Stock Exchange building in cityscape, symbolizing biggest mistakes that changed the course of history.

    In 2005, the Japanese government heavily criticized the Tokyo Stock Exchange over Mizuho Securities’ erroneous sale of 610,000 shares for one yen (less than a penny) each instead of one share for 610,000 yen (approximately $5000). This sale was labelled one of the most expensive mishaps in the history of the Tokyo Stock Exchange, costing Mizuho Securities over 200 million dollars.

    Fox News , Kakidai Report

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    Jrog
    Community Member
    1 month ago (edited) DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    It was a mistake from Mizuho Securities, but also a blatant failure of the Tokyo Stock Exchange. The TSE had no system in place to cancel a running order, despite Mizuho attempting to cancel the order four times within a minute, before it was executed. TSE admitted fault and promised to fix their system, while helping Mizuho to recoup at least part of the losses (about $141M out of $225M) to a threshold where Mizuho's parent company could cover the losses. The fuckup compromised confidence in the TSE, and it took a swift intervention from the regulatory agencies to prevent a runoff that would have crashed Japanese economy.

    #13

    The Piper Alpha Oil Rig Explosion

    Offshore oil rig in the ocean, representing one of the biggest mistakes that changed the course of history.

    On July 6th, in the North Sea in 1988, a miscommunication between shift change workers and a maintenance crew on the Piper Alpha Oil Rig led to an extremely costly explosion. The night shift workers were not informed that pump A had been compromised earlier in the day, and subsequently pumped gas into it. The pump couldn’t withstand the pressure, which caused it to explode, leading to 160 casualties and over a billion pounds in damages at the time.

    Wikipedia , Jan-Rune Smenes Reite/pexels (not an actual photo) Report

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    #14

    Static Build-Up Caused The Hindenburg Disaster

    Wreckage of a collapsed large structure showing one of the biggest mistakes that changed the course of history.

    While the actual cause of the Hindenburg disaster in 1937 is still a mystery, the assumption that static discharge ignited the hydrogen airship is generally accepted. Other suspected causes include sabotage, lightning, and engine failure. The explosion claimed the lives of 36 people and brought the airship era to a halt.

    Wikipedia , Associated Press Report

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    Kim Kermes
    Community Member
    1 month ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    Using a highly flammable coating for the skin and depending on hydrogen were others. No one would sell helium to the nazis.

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    #15

    The Burning Of The Library Of Alexandria

    Ancient scholars examining scrolls inside a historic library representing mistakes that changed the course of history.

    The Library of Alexandria in Egypt was home to over 40,000 papyrus scrolls and was one of the biggest, most significant libraries of the ancient world. Approximately 2,000 years ago, it was ravaged by an enormous fire that decimated all the pieces it housed, including those by Socrates and Horner. While the exact cause of the fire isn’t known, some believe that Julius Caesar mistakenly started the fire that burned it down in 48 BC during his civil war.

    Wikipedia , Tolzmann, Don Heinrich; Alfred Hessel and Reuben Peiss Report

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    #16

    The Mars Climate Orbiter Can't Convert Its Units

    Space probe with solar panels orbiting a planet, illustrating one of the biggest mistakes that changed the course of history.

    A measurement mismatch caused the Mars Climate Orbiter to disintegrate in 1999. It was launched by NASA to gather information about Mars’s atmosphere, climate, and surface changes. NASA and Lockheed Martin, the spacecraft builder, used two different measuring systems (SI units and US customary units) for the ground software, resulting in the discrepancy between desired and actual orbit insertion, which led to the Orbiter getting too close to the atmosphere.

    Wikipedia , NASA/JPL/Corby Waste Report

    #17

    A Wrong Turn Started WWI

    Historic black and white photo of a vintage car and group of men near columns depicting biggest mistakes that changed history.

    On June 28th, 1914, in Sarajevo, a wrong turn led to the assassination of Franz Ferdinand, the Austro-Hungarian Archduke, and his wife. Earlier in the day, a group of assassins tossed a grenade at his vehicle, missing it, but hitting the car traveling behind it. Later on in the day, the Archduke and his wife planned to visit the hospital to check on those injured by the grenade. On their way there, their drivers discovered the itinerary had changed and stopped to figure out which route to take. Unfortunately, Ferdinand and his wife were shot in their stationary vehicle by one of the assassins who spotted them. This assassination is believed to have triggered World War I. 

    Wikipedia , Trampus Report

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    MeowZedong
    Community Member
    1 month ago (edited) DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    If his assassination was all it took to spark WW1 it was inevitable.

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    #18

    The Cuban Missile Crisis

    Cold War missile launch site with a U.S. Air Force missile, illustrating biggest mistakes that changed history.

    During the Cold War in 1962, the US and the Soviet Union fought over missiles placed in Cuba. In 1961, the US put nuclear missiles in Italy and Turkey after their sabotage in Cuba a year earlier. To deter a future invasion by the US, Cuba allowed the Soviet Union to place their nuclear missiles in the country. When the US government caught wind of this, a naval blockade was ordered to stop more of the Soviet Union’s missiles from entering Cuba. A secret agreement was eventually reached between the two countries, which involved the withdrawal of the Soviet Union’s nuclear missiles in Cuba in exchange for the US withdrawing its missiles from Turkey and their declaration not to invade Cuba again.

    Wikipedia , U.S. Army Report

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    Bear Hall
    Community Member
    1 month ago (edited) DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    BS: The American missile's were much farther from the Soviet Union than the Russians' in Cuba. If they were fired they would have been in Washington in 15-20 minutes. It wouldn't have left enough time for the US to react meaning the Mutual Destructin Doctrine wouldn't stop the Soviets any more to start WW3. The Americans simply couldn't let nuclear weapons stationed so close to their shores. They thought only the missiles launch sites were built yet in Cuba, it's enough to proclaim naval blockade around the island to stop the Russian ships with the actual nuclear weapons. In the meanwhile the got ready to invade Cuba to prevent it to happen again. The Soviets were suprised by the American reaction. They didn't realize it would be the first time since 1812 the US heartland is seriously threatend from outside. The agreement was public: the US promised not to invade Cuba and withdraw its rockets from Europe, Soviets promised they won't send nuclear weapons to Cuba.

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    #19

    Columbus Missed Asia

    Vintage map of the Atlantic Ocean and surrounding lands illustrating historical geographic mistakes that shaped history.

    Christopher Columbus, an Italian voyager, was determined to find a route from Europe to Asia. He traveled west and eventually stumbled upon the Americas, which he mistakenly believed was the Indies. Although he never actually found a route to Asia, he triggered the boom of European exploration.

    Wikipedia , Bartholomew, J. G. Report

    #20

    Mexico Attacks The Alamo

    Vintage illustration of a ruined stone fortress and horse-drawn carriage representing biggest mistakes that changed history.

    The Battle of Alamo was an important turning point in the Texas Revolution. In a campaign to reclaim Texas after a 13-day siege, Mexican forces launched an attack on 200 Texian fighters stationed at the Alamo mission. They overwhelmed the Texians after three attempts, almost completely wiping out the garrison. In search of revenge, the Texian army, just a few weeks later, annihilated the Mexicans in a surprise attack called the Battle of Jacinto.

    Wikipedia , Frank Thompson, The Alamo Report

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    Strahd Ivarius
    Community Member
    1 month ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    And remember that the US colonists in Texas were revolting against Mexico rule because Mexico decided to end slavery...

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    #21

    Atomic Bombing Caused By A Translation Mistake In Japan

    Aerial view of a city devastated by a massive disaster, illustrating one of the biggest mistakes that changed history.

    Believed to have been caused by a translation error, the Hiroshima bombing in 1945 resulted in over 140,000 casualties. Allied forces (US, UK, Russia, and China) issued an ultimatum to Japan to surrender and end WWII. Japan’s premier, Kantarō Suzuki, responded with ‘mokusatsu,’ meaning they were reserving comment, but the Allies took this to mean Japan was ignoring the ultimatum. This mistranslation led to them proceeding with the bombings of Hiroshima and Nagasaki.

    Boris Naimushin , NY Times , Wikimedia Commons Report

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    Kim Kermes
    Community Member
    1 month ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    Reserving comment to an ultimatum is the same as ignoring it.

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    #22

    General Pickett Charged Directly Into Enemy Hands

    Tombstone monument in a field representing one of the biggest mistakes that changed the course of history.

    On the final day of the Battle of Gettysburg, General Robert E. Lee ordered about 15,000 troops led by General George Pickett to charge the Union position led by General George G. Meade. Lee didn’t know Meade was already aware of his plans the night before. After moving across the open field, Pickett’s army took heavy fire, leading to the tragic loss of 6,000 Confederate troops.

    Wikipedia , Joshua Sherurcij Report

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    Jrog
    Community Member
    1 month ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    "the tragic loss of 6,000 Confederate troops" I mean, they were the pro-slavery, white-supremacist, anti-human rights, authoritarians ones; not sure how "tragic" it feels.

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    #23

    Japan Ignoring Pearl Harbor’s Fuel Tanks, Repair Yards, And Aircraft Carriers

    Aerial black and white photo of a harbor with ships and surrounding land showing one of the biggest mistakes in history.

    To hinder the US strength at sea, Japan sent over 300 fighter jets and multiple bombers to attack their battleships at Pearl Harbor on December 7, 1941. During the attack, Japan directed most of its fire at the battleships and not at the repair yards, fuel reserves, or even aircraft carriers. After the attack, the US used these resources to repair most of the damaged ships, and as tensions escalated, it used aircraft carriers and submarines to assert its naval dominance.

    Wikipedia , U.S. Navy Report

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    IORN
    Community Member
    1 month ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    The carriers were not in port on that day. If they had been they woud have been attacked too.

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    #24

    Someone Forgot To Lock A Gate In Constantinople

    Aerial view of an ancient city with historical architecture illustrating biggest mistakes that changed history.

    In 1943, the Ottoman Empire stormed Constantinople for 53 days with an army of 80,000 men. The Byzantine defenses only included about 5,000 men, making it easy for the Ottoman Empire to overpower them. It is alleged that an unlocked gate in the walls of the city made it even easier for the Ottoman invaders to enter the city.

    KOHA daily , Hbomber Report

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    #25

    Captain Edward Smith Crashing The Titanic

    Historical illustration of the Titanic sinking with lifeboats and people struggling in the water, showing biggest mistakes in history.

    Not being able to see the icebergs ahead ultimately led to the sinking of the Titanic in 1912. Unfortunately, this caused the loss of over 1,500 people on board. Before the ill-fated journey, David Blair, a second officer, mistakenly left the ship with the keys to the binoculars stored in the cabin when he was reassigned. Without access to the binoculars, Captain Edward John Smith didn’t see the icebergs in time, leading to the unfortunate crash.

    Wikipedia , Magazine Die Gartenlaube , How Stuff Works Report

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    Kim Kermes
    Community Member
    1 month ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

    This is a common myth. However, the mistake was made by going at full speed through an area known to have icebergs.

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