As a result, in 1865-66, most Southern state legislatures enacted restrictive laws known as Black codes, which strictly governed Black citizens’ behaviors and denied them suffrage and other rights.
Radical Republicans in Congress were outraged, arguing that the Black codes went a long way toward reestablishing slavery in all but name. Early in 1866, Congress passed the Civil Rights Bill, which aimed to build on the 13th Amendment and give Black Americans the rights of citizens. When Johnson vetoed the bill, on the basis of opposing federal action on behalf of formerly enslaved people, Congress overrode his veto, marking the first time in the nation’s history that major legislation became law over a presidential veto.
The 14th & 15th Amendments
With passage of a new Reconstruction Act (again over Johnson’s veto) in March 1867, the era of Radical, or Congressional, Reconstruction, began. Over the next decade, Black Americans voted in huge numbers across the South, electing a total of 22 Black men to serve in the U.S. Congress (two in the Senate) and helping to elect Johnson’s Republican successor, Ulysses S. Grant, in 1868.
The 14th Amendment, approved by Congress in 1866 and ratified in 1868, granted citizenship to all persons “born or naturalized in the United States,” including former slaves, and guaranteed “equal protection of the laws” to all citizens. In 1870, Congress passed the last of the three so-called Reconstruction Amendments, the 15th Amendment, which stated that voting rights could not be “denied or abridged by the United States or by any state on account of race, color, or previous condition of servitude.”