The USA in the 20th century By d_smirnova_a 1903 The Wright brothers fly the first powered aeroplane 1914 World War I begins in Europe 1920 Women in the USA given the right to vote 1929 The US stock market crashes. 1941 Japan bombs Pearl Harbor. USA enters World War II 1945 Atomic bomb dropped on Hiroshima, Nagasaki 1945 Nazi concentration camps exposed_ 1954 The end of racial segregation in US schools 1963 President John F, Kennedy assassinated in Dallas 1969 First man walks on the moon