The poll tax, literacy test, and grandfather clauses were a)barriers to prevent african americans from voting b)measures supported by the niagara movement c)declared unconstitutional in plessy v. ferguson

several states had passed similar laws, but they were limited to intrastate businesses. the sherman antitrust act was based on the constitutional power of congress to regulate interstate commerce.

you answered my friends question just to get the coins you didn't even give a valid response.