sure, any time frame you looking for? I think our bombings of Cambodia and Laos and the secret invasion of Cambodia could of lead too the Vietnam War growing, if you're looking for a way different war... the Angolan Civil War was a proxy war between the USA and the USSR, looks a lot like Vietnam War, a fight against an American allied colonial power that turns into a Communist Vs non-Communist civil war, so rather than trust South Africa to do our dirty work the US puts boots on the ground, also the Mozambican Civil War.