Answer:
Most likely because of potato famine. A lot of starvation happened and there were diseases.
Answer:
Pearl Harbor, midway, battle of normandy, Hiroshima
Explanation:
Starts with attack on Pearl Harbor by Japan and ends with America dropping atomic weapons on Japan.
Answer:
Decolonisation and nationalism
Explanation:
In the modern era after world war I many colonies gained their Independence, this led to lots of pride and nationalism