"A house divided against itself can not stand"
It's just as true about ethnic, racial , or religious divisions as it was about pro or anti slavery.
This is the method devised by the Frankfort school in the 1920's to destroy Western culture in pursuit of the Communist world state. Women's rights, divide men and women, destroying the nuclear family, Gay rights, and "separation of Church and state, Under mine the moral fabric of society, Special treatment for minorities, create racial tensions and further divide society into easily controlled special interests, Rich versus Poor, generate class hatred.
Each one is a direct, calculated attack on national character with the goal of building a society of "citizens of the world" who can not exist with out the favor of the state.