Which of the following was a major reason the United States exchanged neutrality for war in 1917?
AAmericans felt it was their duty to come to the aid of the Central Powers, who were being badly beaten.
BThe Germans had taken over a vital trade route between Britain and the United States.
CThe Germans massacred the entire population of a major British city, including civilians.
DThe Germans used their submarines to attack ships carrying American citizens and supplies to the Allies.
AAmericans felt it was their duty to come to the aid of the Central Powers, who were being badly beaten.
BThe Germans had taken over a vital trade route between Britain and the United States.
CThe Germans massacred the entire population of a major British city, including civilians.
DThe Germans used their submarines to attack ships carrying American citizens and supplies to the Allies.