Because the state and local GOVERNMENTS in those jurisdictions passed and enforced what were called the Jim Crow Laws. Laws. Passed by the Democratic Party, in charge at the time. Here's how the modern democrat party plans on beating President Trump by electing Joe and Kamela this November:
BLM Antifa harass diners at outdoor restaurant in Pittsburgh… – CITIZEN FREE PRESS
Excellent. Balls are growing. But it seems there is never a shortage of uniforms to enforce tryanny: Coronavirus: ?Freedom Day Rally? protesters and police clash across Sydney | 9News Australia - YouTube