The Holocaust started 1933 and ended in 1945 in that time 6 million Jews were killed some were killed on the concentration camps of before because the weak would go to the gas showers
Attack on Pearl harbor
Germany invades Poland from the west using the Blitzkrieg then 2 days after France and Britain declared war on Germany.
Hitler invaded Britain in 1940 for a month Britain's air force battled Germany as London was getting bombs dropped on them every night.
Defeat of Japan
On December 7,1941 Japanese bombed American army base in Hawaii killing 2,400 men and destroyed ships the next day president Roosevelt asked congress to declare war on Japan.
On June 6th, 1944 he allies did a surprise invasion on Normandy in France more than 156,000 troops crossed the English channel that day 2,500 lives were taken by August the Allies made it to Paris and freed German control.
President Harry Truman decided to use the atomic bomb on Japan on August 6, 1945 an American plane dropped the atomic bomb over the city Hiroshima then 2 days later a second atomic bomb was dropped on the city Nagasaki.