How did supporters of US imperialism justify the nation's actions in the South Pacific during the 20th century? * They argued that it was the United States' responsibility to provide international security in the Eastern Hemisphere
They argued that it was the United States' duty to spread its political and cultural beliefs and institutions to other nations.
They argued that containing the spread of communist ideology outweighed the cost of US military intervention in the region.
They argued that the United States must compete with European nations for resources in order to protect its economic interests.