What are the visa requirements for a 90-day trip to Thailand, Vietnam, and Cambodia?

@Biff **************************

Is Vietnam in Thailand? Laziness is not a cool trait.

@Robert *******

you’re welcome… It is the Vietnamese government official website… So that is probably the only one you want to use

@James ********

correct. And ya know why? Vietcong are still looking for war criminals. Can't blame 'em for doing a check on Yankees before they let 'em in

@Gregor *********

interesting that a German is mentioning U.S. war crimes. Neither country has a clean history.

@Biff **************************

if you don't like my explanation, why Vietnam asks for pre-arranged visa for U.S. citizens, then you'd better stay clear of South East Asia, and join the great force of stvpid uninformed Americans. Do you want to know why you are not welcomed in Laos? Because Americans dropped more tons of bomb load onto Laos than they dropped onto Germany in WWII. USA killed tens of thousands of innocent people. in Laos. And sprayed large areas with illegal cluster bombs, which are still unexploded ordnance, and still cause injuries and deaths until today. Does America take responsibility? No, they don't. So you better just accept what people in these places think of you

Update:

Here is the email of the company that I used. Worked out fine for me.