Question

Why did USA join the 1 world was?

Answer 1

answer by MASTER HARSH

The United States entered the warbecause of the Germans' decision to resume the policy of unrestricted submarine warfare, and the so-called "Zimmerman telegram," intercepted by the British, in which Germany floated the idea of an alliance with Mexico.

hope you understood

Answer 2

They entered because Japan had dropped a bomb in Pearl Harbour, a city on coastal USA.