The US Civil War (1861-1865) & the Vietnam War (1961-1975).
Thailand sent troops to South Vietnam.
President Eisenhower.
Canada did not send combat troops to Vietnam during the Vietnam War. Instead, Canada maintained a stance of neutrality and provided support through diplomatic means and humanitarian assistance. While some Canadians served in non-combat roles, such as in medical or advisory capacities, the country as a whole did not participate in the military conflict.
Combat troops in March '72, everyone else in April '75.
Yes. In fact both countries had combat troops helping South Vietnam during the Vietnam war.
he was the prime minister of Australia and he sent the troops to Vietnam
Prior to the start of the Vietnam War, the North Vietnamese launched an effort to bring communism via revolution to the country with assistance from the Soviet Union and China. Responding to pleas for aid, Eisenhower sent aid to South Vietnam and Kennedy sent military advisors. At the height of the Cold War, fearing a communist advantage, President Johnson sent combat troops to Vietnam.
Australia was an ally of the US and sent troops to fight in both WWII and Vietnam.
The Philippines sent support troops to Vietnam.
Johnson declared war on poverty. He did not win. He did not declare war on Vietnam but sent 500,000 troops there. He did not win.
Several: Dwight D Eisenhower (1952-60) was President when the US first sent military advisors to Vietnam, followed by John F Kennedy (1961-63); Lyndon B Johnson (1963-68), who first sent combat troops; Richard M Nixon (1969-74), who withdrew all combat troops under intense pressure from Congress and the public; and Gerald R Ford (1974-76), who was President when North Vietnam defeated South Vietnam.