How were the Communists able to continue causing trouble in the South?

The United States proposed the Policy of Containment, to keep out or contain Communism. The boundary dividing Europe into two separate areas at the end of WWII. An American foreign policy created to stop Soviet imperialism during the Cold war.

battle of saint-mihiel, (12–16 september 1918), allied victory and the first u.s.-led offensive in world war i. the allied attack against the saint-mihiel salient provided the americans with an opportunity to use their forces on the western front en masse.

explanation:

b) the confederacy had to pay all union war expenses.