How did supporters of the US justify its imperialism and actions in the South Pacific during the the twentieth century? A) They argued that the United States has a duty to spread its political, economic, and cultural beliefs and institutions to other nations. B) They argued that it is up to the United States to act as the "policeman" of the Western Hemisphere in the interests of global security. C) They argued that in order to protect its economic interests, the United States must compete with European nations for global influence. D) They argued that nations must be allowed the opportunity to realize their potential without foreign intervention.