It was always bombed, accidently on purpose; then intentionally secretly under the new commander in chief Nixon. US troops were always there, but covertly.
The official conventional US/allied invasion (which is politely called "incursion") occurred on 01 May 1970.
Cambodia
Because Cambodia is a developed country. And Cambodia is a poor country,and US wants to help poor countries.
Laos and Cambodia.
Cambodia. Is the country that Nixon invaded wihout telling Congress.
Un-officially, President Nixon used B-52's to bomb Laos & Cambodia. Officially, Nixon bombed North & South Vietnam with B-52s.
Laos and Cambodia
Nobody, this never happened.
Cambodia & Laos.
bomb Japan or invade it
Invade Japan at the cost of 2 million US soldiers.
President Richard M. Nixon
Cambodia
He didn't invade any country. With backing from the PRC (China), he overthrew the government of Cambodia. He was later ousted by an invasion by the Vietnamese.
Japan never started war with Cambodia, they just came to control Cambodia. They did invaded Thailand, but they didn't invaded Cambodia. If they invade, they might had to fight against France because Cambodia at that time was also under control of France.
Cambodia.
Hem Heng is the Ambassador to the US for Cambodia.
The Asian nation of Cambodia is independent of the US .