The Supreme Court never ruled that states were compelled to discriminate against African Americans. The Southern states could of vigorously declared that all state citizens were vigorously protected under the law.The Republicans took it all away with a Supreme Court decision in 1883. Declared that the 1875 Civil Rights Law was unconstitutional.
During this time period Western Native Americans were murdered at will by the Federal Government.
1883 Chinese Exclusion Act. Banned an entire Race from Immigration. Few exceptions.
1870 the Federal Government confirmed White in our Immigration Laws.
Can’t blame it all on the South.
As far as the Indian's and Chinese are concerned what Southern politicians objected to US government policy towards them?