1940, President Roosevelt received a letter from a boy of 12 years old in Cuba. "My dear friend President Roosevelt", this kind of address is rare in letters to the President. The little boy said, "I am a Cuban child. My home doesn't seem too far from where you live. I am a clever boy. Although I am only 12 years old, I often think about problems. " It seems that what he said is true. At this moment, he is obviously thinking about how to put forward what he wants to the president of the United States. "I like to collect some valuable items, such as dollar bills. Can you give me a 10 dollar bill? I haven't seen the green 10 dollar bill yet! You will definitely give me what I want. Isn't it? " The signature at the end of the letter is "Fidel Castro".

The U.S. Foreign Office gave a quick reply. This incident caused a sensation in Castro's school. However, the child's wish was not satisfied, because there was no bill of 10 in the letter.

President Roosevelt never imagined that the 12-year-old Cuban student's request for 10 dollars in banknotes was rejected, but in the future, the United States was heartbroken-in order to prevent his attack, the United States spent thousands of banknotes.

Just 19 years after he wrote to President Roosevelt, Castro overthrew Batista's dictatorship and established a revolutionary government, which also opened the prelude to the hostility between the United States and Cuba. And it lasted for more than forty years.

Another child who wrote a letter to President Roosevelt became a celebrity in the future. He wrote to the president to express his thanks.

Also on 1940, Roosevelt sent a set of stamps and an album to a 9-year-old child in Massachusetts. The boy looks very cultured. He immediately wrote back: "Dear Mr. President, I like the stamps and photo albums you sent me very much. Shortly after I started collecting stamps, my mother said that you also love collecting stamps. I really want to have a chance to see your stamp album ... My father and mother asked me to extend my heartfelt greetings to you. " The signature at the end of the letter is: John Kennedy.

He is the 35th president of the United States, John F. Kennedy, and the youngest president in American history.

From Castro's letter, it seems that we can appreciate a mischievous and overbearing character, which happened to be fully reflected in his later leadership career, while Kennedy was gentle. For the supreme president, he is only polite, not humble.