What happened during world war 2 that hanged history ?

The Holocaust

Explanation: People say the main reason WW 2 started is because of the Holocaust. There was a large group of men named "The Nazis" and they tried to get rid of all the Jews and people with disabilities they all thought the perfect race is Blonde hair and Blue eyes. The leader of the Nazis you probably heard of him... Adolf Hitler he murdered himself April 30, 1945

by 1890, the united states had by far the world's most productive economy. american industry produced twice as much as its closest competitor--britain. but the united states was not a great military or diplomatic power. its army numbered less than 30,000 troops, and its navy had only about 10,000 seamen. britain's army was five times the size of its american counterpart, and its navy was ten times bigger. the united states' military was small because the country was situated between two large oceans and was surrounded by weak or friendly nations. it faced no serious military threats and had little interest in asserting military power overseas.