how did discriminatory law continue to exist after the Union won the Civil war and the reconstruction amendments were passed?

In 1865 and 1866 southern states pass "Black Codes" which were laws to restrict the freedom of Blacks in the region. In the north these codes were viewed as a way to get around the 13th amendment and to allow slavery to exist under a different name. The defining feature of the post-Civil war Black Codes were vagrancy laws which allowed for the newly freed Black population to be arrested and sentenced to hard labor. In 1866 the Radical Republican congress reacted by placing the south under military rule as part of their program of Reconstruction and to pass various laws such as the Civil Rights Act of 1866 and the 14th Amendment. Military reconstruction would last until 1877.

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