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.
Which statement best describes the reliability of this source?
Its content is mostly reliable because it accurately describes how the war began.
Its content is mostly reliable because it describes the true cost of the war.
Its reliability is questionable because it ignores North Korea’s invasion of South Korea.
Its content is unreliable because it opposes the US policy of containment.