WW2
Why did WW2 start
World War 2 started because Germany and Russia invaded Poland. Also after WW1 Germany was treated badly and their economy was failing because they had to pay war debts. Hitler also started the Holocaust which was the extermination of the Jews.
Weapons of the war
Everybody used many different weapons. They used pistols, rifles, machine guns, sub machine guns. and some used flame throwers. The Germans used gas and 2 huge railway guns called Gustav guns.
Technology of the war
In the war Germany won air superiority quickly as the French neglected their air force and the British planes couldn't target ground units. Some technological innovations were biological weapons, atomic weapons, rocketry, chemical weapons, chemical medicines, and surgical innovations.
America
During this time we again had an isolationist mind-set and only came into the war when the Japanese bombed Pearl Harbor. We had advanced weaponry and retaliated with airstrikes and 2 Atomic bombs.
The End of WW2
The last and largest battle was the battle of the Bulge and after the Allies won Hitler committed suicide and the holocaust was ended.