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Propaganda: idea, facts, or rumors spread deliberately to further one’s cause or to damage an opposing cause.
War of attrition: slow wearing-down manner of warfare in which each side tries to outlast the other.
Contraband: war materials supplied by a neutral nation to a belligerent one.
Atrocities: brutal crimes of war, often committed against civilians.
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Central Powers: Germany, Austria-hungary, Bulgaria, and the Ottoman Empire.
Allied Powers: Great Britain, France, Russia, and their parterns.
U-boats: German submarines.
Woodrow Wilson: U.S. president; who denounced the attack. he warned Germany that the united states would not tolerate another such incident.
Arthur Zimmermann: a high official in the german foreign ministry.
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1. New technology changed the way the war was fought because many weapons were introduced that had never been tried before. Like the use of submarines by the Germans, or the poison gas as a  weapon against enemy infantry. New technology made it easier to fight the war. The weapons became more effective. As well as airplanes, they were used to observe enemy troop movement.

2. The principles for the United States to enter war were the Germans. The united states used to trade with both, Great Britain and  Germany. It stopped trading with Germany. Because it started searching the boats that went into Great Britain. Germany blew up the Lusitania. Finally the U.S. entered the war.