Why Did The US Enter WW1

The
United States entered the war because 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. Unrestricted
submarine warfare, a desperate effort to counter the British blockade of Germany, would lead to
the sinking of American merchant ships heading for England, and had been employed by the Germans
before. They abandoned it in the face of US pressure earlier in the war. Its resumption was
enough to cause Woodrow Wilson to renounce his...