I was very eager to know the answer to the question, so I did a little research and saw that 1 mistake cannot be called the best. I really like 10 mistakes because if it weren't for these mistakes we would be really at peace! :) Below are some bullet points.
1. Henry Tandy, an English soldier in World War I, faced Hitler on a battlefield in France. Hitler was an ordinary soldier then. Henry could have easily killed Hitler if he wanted to. But Henry decided to beg for the life of the wounded Hitler. Had Henry assassinated Hitler that day, perhaps World War II and the most brutal genocide in history would not have taken place.
2. Prior to publication, JK Rowling's Harry Porter series manuscript was abandoned by 12 publishers. Eventually, her father, Harry Porter, published it on the advice of Ellis, the owner's 8-year-old daughter, the owner of Boomsbury Publishers. Harry Porter is currently translated into 60 languages and has earned about 1 billion euros from Rowling A.
3. After the Greeks occupied the Roman city of Alexandria, they decided to burn down the Alexandria Library. Alexandria was then the richest library in the world. It was also considered as the wisdom of the world. After the burning of this library, almost two-thirds of the knowledge of the then world was lost forever.
4. Napoleon and Hitler both made the same mistake. Napoleon and Hitler's army could not survive the severe winter in Russia. This mistake led to the decline of both Hitler and Napoleon.
5. The bipartisan Alexander the Great did not announce any successors before his death. Which led to the collapse of his world-conquering empire.
6. In 2009, Facebook turned down job offers for two programmers, Brain Octon and Jam Koom. Coming back from Facebook, these two programmers started working on their own projects and created WhatsApp. A few years later, Facebook realized its mistake and bought WhatsApp from Brain and Jam for about 19 billion.
7. In 2016, France's railway department ordered 15 billion worth of new modern trains. But after the production of the train was over, it was seen that these trains were so wide that they could not enter about 1300 railway stations all over France. Later, it was decided to fix those 1300 stations at a cost of Rs 50 million. The French Railway Department could have corrected this mistake with a little caution.
8. The largest wildfires in recent history were organized due to the slightest mistake of a hunter. The blaze, which broke out in the US state of California, was caused by a Freyr fire. When the two hunters separate while hunting, one throws a freaker to find the other. This freaker caused the fire, which caused a loss of 15 billion dollars.
9. Dutch or Dutch sailors discovered Australia about 100 years before the British. But did not establish a colony there thinking it was a barren desert. Which is one of the biggest mistakes in Dutch history.
10. Russia's rulers have repeatedly been troubled by its vast size. The Russians considered Alaska a barren land and sold it to the United States for two paise per acre or about 6.5 million. A few years after the purchase, the Americans discovered many gold mines in Alaska. Alaska also has abundant rich gas and oil mines.
Thanks to everyone for reading my article