which was a major cause for the entry of the u.s. into world war i? a) germany's invasion of belgium b) the desire to collect reparations c) russia's decision to leave the war d) germany's decision to resume unrestricted submarine warfare
Germany's decision to resume unrestricted submarine warfare. When they made this decision they hit tons of British civilian ships carrying innocent Americans.
Germany’s decision to resume unrestricted submarine warfare was an immediate cause for the entry of the US into World War I. While the timing was great, Russia's exit from the war was not a factor in the U.S.'s decision to enter.
