Answer:
US demostic politics, culture, and society
On March 3, 1865, Congress passed “An Act to establish a Bureau for the Relief of Freedmen and Refugees” to provide food, shelter, clothing, medical services, and land to displaced Southerners, including newly freed African Americans.
"The United States withdrew its support." was perhaps the most immediate result of Diem's refusal to hold elections, but it should be noted there were others as well.
Cause of growing opposition to slavery....
- The abolitionist movement ( anti slavery)
- south vs north ( later civil war)