The correct response is: The federal government passed the Civil Rights Act, which had to be enforced everywhere in the United States.
Additionally, another significant action that asserted federal supremacy during the Reconstruction period was the passage of the 13th, 14th, and 15th Amendments to the Constitution, which collectively obligated states to recognize and protect the rights of African Americans. These actions were pivotal in reinforcing federal authority over states in matters of civil rights.