Theodore Roosevelt Was a Proactive and Forceful President

Theodore Roosevelt was a proactive and forceful president. Building on the Monroe Doctrine from 80 years earlier, he developed the "Roosevelt Corollary," which ___________________________.

A) created an isolationist stance whereby American military forces were not allowed to leave the borders of the United States
B) created an alliance of all English-speaking nations
C) formed an alliance of nations against the developing Empire of Japan
D) declared that the United States would serve as a police power to maintain stability in the Western Hemisphere by opposing European interference in Latin America.
E) launched a preemptive attack on Cuba and began the Spanish-American War.