What invention of Alfred Nobel's was widely used in construction and later in warfare?
A. electric motors
B. dynamos
C. dynamite
D. internal combustion engines

Who were the “rough riders”? a. cuban revolutionaries who battled the spanish for independence b. a volunteer cavalry unit in the spanish-american war c. spanish generals in cuba who mistreated the civilian population d. newspaper owners who influenced public opinion by exaggerating the truth