If the USA was not a democracy and the administration did not have to worry about the lives of the voters sons and daughters they would keep it going indefinitely, However they may also commit so many troops that they would gain control. but you cant control a people that is committed to freeing themselves from an invader.
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1,000 years.
It lasted 10 years.
They are still there they were the victors in the war with the US and now rule Vietnam.
See Communist Vietnam website.
LBJ (Long Binh Jail).