Why were slaves codes/black codes used?

How did the american revolutionary war change how some americans viewed the enslavement of african americans?

The impeachment of president clinton by the u. s. house of representatives occurred with a. virtually all republicans supporting it, while virtually all democrats opposed it b. about two-thirds of republicans supporting it and about two-thirds of democrats opposing it c. half of all democrats and half of all republicans supporting it, while half of all democrats and half of all republicans opposed it d. virtually all democrats supporting it, while virtually all republicans opposed it

Ahistorian claims massive drought and famine in china caused the boxer rebellion. which of the following historians is making a counterclaim?