World War 2 and Japanese Internment
APUSH was restructured 2 years ago, and they made the experiences of minorities crucial to AP US History. So being familiar with Japanese Internment would be good, and it is mentioned in the Key Concept. I showed the shortened version in class, but the full one is worth the watch!
Cold War Beginnings
The video found at YouTube - search Untold History: Stalin, the Soviet Union and WWII - explains nicely Stalin's position during and after WW2. It is an eye opener!