i don't really know but
After the Compromise of 1877 led to the withdrawal of federal troops from the South, Democrats consolidated control of state legislatures throughout the region, effectively marking the end of Reconstruction.
Southern Black people saw the promise of equality under the law embodied by the 13th Amendment, 14th Amendment and 15th Amendment to the Constitution receding quickly, and a return to disenfranchisement and other disadvantages as white supremacy reasserted itself across the South.
As historian C. Vann Woodward pointed out in a 1964 article about Plessy v. Ferguson, white and Black Southerners mixed relatively freely until the 1880s, when state legislatures passed the first laws requiring railroads to provide separate cars for “Negro” or “colored” passengers.