2 Discussion posts for US History

Requirements: two separate discussion posts, needs to have 2 references each. only need a few paragraphs to get the point across.

WWII:

What were the underlying causes of World War II? Select one event that you think irrevocably led the world (and the U.S.) to war more than any other event. Argue your selection with details that support your answer.

Great Depression:

What were the underlying causes of the depression? Why did the Great Depression of the 1930s seem so much worse than any occurring either before or since? Can you see any modern parallels to the Great Depression? Elaborate.