"Prohibition" became a reality with the passage of the 18th Amendment to the Constitution of the U. S. How long was it a law in the United States?

What directive in source a might have been at the root of the action described in source b?

This law states that the "chinese laborers to this country endanger the good order of certain localities" in the united states. which of these would represent a "locality" that would most likely have wanted this law created and passed? a) dallas b) chicago c) atlanta d) san francisco

Who was in charge of american troops during world war i?