The Treaty of Veersailles was a treaty that brought WWI to an end. It ended the state of war between Germany and the Allied powers. The treaty was signed on June 28, 1919.
In 1919, Adolf Hitler joined a small night-wing political group. They all shared the belief that Germany had to overturn the Treaty of Versailles and combat communism. He legally gained power of Germany in January 1933.
The attack on Pearl Harbor was a surprise strike by the Japanese military against the United States on December 7, 1941.