How did european imperialism in africa reinforce ideas about race?

They colonize africa so umm they are poor now and are extractive sniff sniff mf

Explanation:

Since they colonized Africa was left with raw material and some are land locked and since eurapey was inclusive they becamse the opposite beacuse they dont like urope. Making them have a dictator and civil wars and stuff. So yeah

in all honesty, it really hasn't. except that hitler killed himself.

confederacy: supported slavery, believed states should be able to nullify federal laws, supported low tariffs

union: everything else