One of the reasons why the United States entered World War I on the Allied side was because "<span>b. German U-boats sank unarmed ships carrying American passengers," through a policy of "unrestricted" submarine warfare. There were also ideological and racial reasons for joining the Allies as well, however. </span>
During this war, we werent as prepared as we are toay, back in world war 2 the allies had barely and support from the citizens ad barely any supplies to work with.