Athough initially disregarded by the great powers of Europe, the Monroe Doctrine became a mainstay of U.S. foreign policy . In 1823 U.S. President James monroe proclaimed the U.S. protector of the western Hemispere by forbidding European powers from colonizing additional territories in the Americas.
The name "Ring of Fire" implies a wider area of the Pacific Ocean. It is an area with a huge number of active volcanoes. As a percentage, about 40% of all active volcanoes in the world are located in this area.
