The Civil Rights Act of 1866 was a landmark legislation that aimed to protect the civil rights of African Americans in the United States, particularly in the wake of the Civil War and the abolition of slavery. This act was significant as it sought to affirm citizenship rights for all individuals born in the U.S. regardless of race, thus attempting to transition formerly enslaved individuals into full membership in society. It laid the groundwork for further civil rights legislation and marked a pivotal moment in the journey toward racial equality and political participation during Reconstruction.