World war 2
World War 2 World War 2 killed more people, cost more money, damaged more property, affected more people, and probably caused more far-reaching changes than any other war in the history. ... There were 4 main leaders of this war including Hitler, Franklin Roosevelt, Winston Churchill, and Benito Mussolini. This war began on September, 1, 1939 and lasted 4 years. The War was started with 3 main conflicts. One conflict was the problems left unsolved from World War 1. ... The War began when a German aircraft, tanks, and motorized troops attacked Poland.