Who fought against Vietnam?

Vietnam WAS TWO COUNTRIES. The communist north was attempting to take over the free south. The US, Australia, New Zealand, Philippines, Thailand, South Korea, sent troops to help South Vietnam repel the north. North Vietnam was allied to southern communists living in South Vietnam, called the Viet Cong (VC). The communist nations of Red China and the Soviet Union supplied war material for their communist ally, North Vietnam (and the VC).