On September 1, 1939, Hitler and the German forces broke the Nazi-Soviet Pact and invaded Poland. Two days following the invasion, Britain and France declared war on Germany. Even after signing the non-aggression pact, Hitler launched a surprise attack and Poland. World War II had begun.
Japanese Attack on Pearl Harbor
Hitler led a brutal program to kill all people who he believed were racially "inferior," particularly Jews and those who did not meet the Aryan racial ideal, homosexuals, and mentally ill or disabled. Nazis forced them into ghettos or concentration camps where they were dehumanized. Nearly six million people were killed.
The D-Day Assault
On September 1940, Hitler turned his focus to invading Britain and named this planned invasion "Operation Sea Lion." The Luftwaffe launched numerous amounts of explosives and firebombs on London. Citizens of London remained calm and carried on with their lives, and the Luftwaffe was unable to gain superiority over Britain. This attack was unsuccessful.
Defeat of Japan
A sneak attack on December 7, 1941 from the Japanese took place in Hawaii's Pearl Harbor. Japanese airplanes bombed the American fleet and led to about 2,400 deaths and destroyed American battleships and aircraft. Germany and Italy, allies of Japan, declared war on the United States, and America was now in war.
On June 6, 1944, the Allies launched a surprise attack on Normandy. There were heavy German defenses on the beach and over 6,000 men lost their lives. Despite the heavy defense and the losses of lives, the D-Day launch was successful because the allies were able to get the beach back.
Allied scientists conducted the Manhattan Project, which was the making of the first atomic bomb of WWII. On August 6, 1945, a U.S. plane dropped the atomic bomb over HIroshima and over 70,000 people were killed because of radiation. The U.S. dropped the second bomb on Nagasaki and over 40,000 were killed. On August 10, Japanese emperor forced the Japanese government to surrender.