Final answer:
Joseph Hayne Rainey was elected as a Republican, not a Democrat, and he was the first African American elected to the U.S. Congress. The correct answer is option 1.
Step-by-step explanation:
The incorrect statement about Joseph Hayne Rainey is that he was elected in 1870 as a democrat from South Carolina. In fact, Joseph H. Rainey was elected as a Republican. He has the distinction of being the first African American elected to the U.S. Congress and the first to preside over the House of Representatives. Rainey was indeed born into slavery but became a leading political figure after the Civil War during the Reconstruction Era when Black Americans began to hold political office for the first time.