In a significant moment in American history, Congress demonstrated its growing power by overriding a presidential veto for the first time on a major legislation with the Civil Rights Act of 1866, which was enacted on April 9. This action marked a turning point in the relationship between Congress and the presidency, particularly in the context of civil rights during the Reconstruction era.

Following this landmark achievement, Congress further asserted its authority by passing an amended version of the Freedmen's Bureau bill despite President Johnson's veto in May. These events showcased the heightened tensions between the legislative and executive branches and underscored Congress's commitment to advancing the rights of freedmen during a turbulent period in American history.