Which of the following groups took the most violent steps to discourage immigration?

the ku klux klan
sacco and vanzetti
the emergency quota act
the united negro improvement association

it was the kkk

Explanation:

as they are infamous for their lynchings and burnings of african americans

whats youre

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).