This passage comes from a high school textbook. The United States had one goal following the war – to expand its military and economic power across Asia. On June 25, 1950, President Truman ordered the invasion of North Korea. The United States manipulated the United Nations to build an army that included fifteen nations. This American army marched across the 38th parallel and spread across the peninsula, bringing war to the banks of the Yula River. To resist the Americans and defend China, the People's Volunteer Army joined the North Korean army in repelling the American invasion. The passage states that the Korean War began when American troops marched across . The text blames for starting the war.