What legislation aimed to grant citizenship and eliminate Black Codes, which was vetoed by President Johnson?

The Civil Rights Bill of 1866 was designed to grant citizenship to all individuals born in the United States and aimed to eliminate the discriminatory Black Codes that had been enacted in various Southern states following the Civil War. This legislation was crucial in addressing the rights of newly freed African Americans and ensuring their legal protection against discrimination.

When President Andrew Johnson vetoed the bill, it was a significant moment in the struggle for civil rights, illustrating the tensions between the executive branch and the Congress at the time, particularly in relation to Reconstruction policies. Congress ultimately overrode Johnson's veto, marking a key victory for the Radical Republicans who were advocating for more comprehensive civil rights protections.

The other options do not directly address the specific goal of granting citizenship and eliminating Black Codes as the Civil Rights Bill of 1866 did. The Reconstruction Act of 1867 focused on reorganizing the Southern states and integrating them back into the Union with military oversight. The Tenure of Office Act of 1867 was designed to restrict the president's power to remove certain officeholders without the Senate's approval. The 14th Amendment, which would follow later, did establish citizenship and equal protection under the law, but it was not an immediate legislative act like the Civil Rights Bill. Thus