The correct answer is letter E.
Explanation: On April 6, 1917, the United States declared war on the Germans and their allies. A large volume of soldiers, tanks, ships and warplanes were used to ensure the Entente's victory. Before long, the German and Austrian troops were defeated.
it was important because it granted civil rights to some commoners.
World war 2 lasted from 1939-1945 world 2 was a global war including various of countries including United States United Kingdom Soviet Union axis power the nazi France Vietnam Canada Australia Mexico Brazil etc etc etc etc let me know if you need more info :)