The first African American to serve in Congress was

Ebenezer D. Bassett.

Francis Cardozo.

Blanche Bruce.

Hiram Revels.

DONE

Hiram Revels

Explanation:

The first African Americans to serve in the United States Congress were Republicans elected during the Reconstruction Era. After slaves were emancipated and granted citizenship rights, freedmen gained political representation in the Southern United States for the first time. White Democrats regained political power in state legislatures across the South and worked to restore white supremacy. By the presidential election of 1876, only three state legislatures were not controlled by white Democrats. The Compromise of 1877 completed the period of Redemption by white Democratic Southerners, with the withdrawal of federal troops from the South. State legislatures began to pass Jim Crow laws to establish racial segregation and restrict labor rights, movement, and organizing by blacks. They passed some laws to restrict voter registration, aimed at suppressing the black vote.

It was Hiram revels