The u. s. entered the war in 1917 because a. germany declared unrestricted submarine warfare. b. of the zimmerman telegram. c. they sided with the allies. d. all of the above circumstances were true.

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.

answer: the unlawful use of violence and intimidation, especially against civilians, in the pursuit of political aims.

explanation: