This answer will be c because
Richard Nixon was the first president to ever resign from the presidency. He did so so he could avoid being the first president to ever be impeached.
For number one I'll say either A or C and for number 2 I'll say either A or B
After WWI and during the Great Depression the US tried to be an Isolationist nation. They put out tariffs so people would buy US (forgetting that the rest of the world was still devastated by WWI (economies included)).