Things I Know About WW2

Here is a list of things I think I know about World War Two:
-America was allied with England and France
-Pearl Harbor brought America into the war
-It was as brutal as any other war, My Grandfather never talked about it.
-The war ended when the US dropped the Atomic Bomb and Hiroshima and another Japanese city, don't remember the name.
-Aerial combat became a large part of warfare
-bomb shelters were everywhere, the threat of enemy bombing runs was huge.
-there were blackouts where cities would make all windows black so that bombers could not identify them as targets at night.
-the war was fought on land, sea and air
-The nazis used the jews as scapegoats
-concentration camps were set up in Germany and other Nazi controlled countries
-Sweden was neutral
-Switzerland was neutral
What I hope to learn about WW2

-Why it was started in the first place
- Why did Japan get involved
-What was Austria's role in WW2
-What were the ramifications of WW2
-Why were submarines important in WW2
-What were the new war strategies developed for WW2