Let me know when you get a job or a green card to teach ESL ... buddy :)
I already know people in two different cities who have regular jobs teaching English... one teaches it to new immigrants through the LINC (Language Instruction for Newcomers to Canada) program... while the other teaches it for workforce preparation programs offered by the United Way.
So there you go - and I'm sure the situation is the same in any other English speaking country.
I'm not saying that there are a lot of jobs in this field... but there certainly are jobs and I only wanted to rectify your statement where you said: "Usually you teach English aboard in a country where people don't speak English. There's no need for basic English instruction in the US."
You didn't say anything about being able to get a green card for this purpose... which obviously is difficult these days irrespective of your line of work and more so for skillsets which are readily available.
Anyways, this is off-topic since the original poster didn't even mention anything about teaching English.