During Reconstruction, white supremacists in the mostly South targeted Congressmen and state military governors.
Congressmen and other Radical Republicans.
African Americans, carpetbaggers, and scalawags.
African Americans and Southern Democrats.

African American and Southern Democrats

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate