Except D. some federal troops would remain in the South to protect the civil rights of African Americans
During World War I, Germany had been blockaded, so they didn't have the fertilizer for their crops and the food to survive, which then led to deaths. After the war, Germany was just really inefficient, and they had major problems. These problems then led to Hitler becoming the tyrant of Germany, which then led to World War II because he blamed all of the problems on the Jewish people, which then made even more problems.
The Organization of Petroleum Exporting Countries unites countries extracting petroleum that are involved in the Middle East, since no western states are members.
BECAUSE THE FEDERATION NEEDED OCCUPANCY