Why did the united states get pulled into world war i?

a. mexico attacked the united states.

b. germany owed the united states money for war supplies.

c. the united states was shown a letter from germany encouraging mexico to invade america.

A.) No, Mexico did not attack the United States

B.) No, the war only caused more debt they would not of wanted to join over money.

C.) Yes, they retrieved a letter and it revealed that the country sending the letter was trying to find ways to make us join. In the early 1900s we were attempting to return to our safe isolationist country - - but world war 1 didnt allow for this to stay.