What event helped provoke the United States to enter world war 1?

Answer 1

Germany attempting to from a military alliance with Mexico

Answer 2

Atrocities were committed against American ships by both the British and Germans, but the final push that convinced the United States to join the Allied forces was the sinking of the Lusitania by a German submarine.

Answer 3

Most people believe that it was the sinking of the British ship the Lusitania, but it was most likely the fact that Germany returned to unrestricted submarine warfare once Russia backed out of the war.

Answer 4

germany attempting to from a military alliance with Mexico