Ho Chi Minh City (Thành phố Hồ Chí Minh), formerly named Saigon, is the largest city in Vietnam. Under the name Saigon, it was the capital of the French colony of Cochin-china and later of the independent republic of South Vietnam from 1955–75. South Vietnam, as an anti-communist, capitalist republic, fought against the communist North Vietnamese and Viet Cong during the Vietnam War, with aid from the United States and countries including Australia, New Zealand and South Korea.