The Fourteenth amendment would be the least relevant for interpreting changes to government policies during reconstruction era.
Following the American Civil War (1861–1865) and continuing roughly until the Compromise of 1877, the Reconstruction era was a time in American history. Congress abolished slavery at this time, put a stop to Southern Confederate secession, and passed the 13th, 14th, and 15th Amendments to the Constitution, purportedly guaranteeing newly freed slaves (freedmen) the same civil rights as white people. After year of violent attacks on Black people in South, Congress federalized protection of civil rights in 1866, placed former secessionist states under American military control, and mandated that before former Confederate states could be readmitted to Union, they adopt protections for civil rights of freedmen.
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