Answer: They entered WW1 because of Germany's attacks merchant and passenger ships. Their entrance into the war helped move the balance to the allies, giving them a stronger militia and taking the States out of their neutrality policy.
german boats would sink America's transports ships
Explanation:
The impact of the United States joining the war was significant. The additional firepower, resources, and soldiers of the U.S. helped to tip the balance of the war in favor of the Allies. When war broke out in 1914, the United States had a policy of neutrality.
