What was the zimmerman telegram?
a. a telegram sent by germany to woodrow wilson declaring war against the united states
b. a telegram sent by an american diplomat pledging united states loyalty to the british prime minister
c. a telegram sent by an american diplomat to a mexican foreign minister assuring mexico of the united states neutrality
d. a telegram sent by a german foreign minister to mexico encouraging the nation to go to war against the united states if the united states declared war against germany