Answer: A. Black men, carpetbaggers, and scalawags.
Explanation: Scalawags were were southern supporters of the republican party and the reconstruction. All three groups joined southern politics after the Civil War. A large contingent of African Americans served in the American Civil War. The 186,097 black men who joined the Union Army included 7,122 officers and 178,975 enlisted soldiers. Approximately 20,000 black sailors served in the Union Navy and formed a large percentage of many ships' crews. Later in the war, many regiments were recruited and organized as the United States Colored Troops, which reinforced the Northern forces substantially during the conflict's last two years. Both Northern Free Negro and Southern runaway slaves joined the fight. Throughout the course of the war, black soldiers served in forty major battles and hundreds of more minor skirmishes; sixteen African Americans received the Medal of Honor. The black people were emancipated African-American people who joined the local governments. Carpetbaggers were northern politicians who moved south in order to attain wealth and high political power.