Buying isn't the problem, with enough money, it is the legal operation of the vehicle, and securing a valid driver's license.
Yes, as long as you have the cash.
no
Yes
You can buy a car for that much money.
you have to be 21 in the US to buy beer you have to be 21 in the US to buy beer
yes
A cheap Chevy car in the US are those from the year 2000 or below. They run for very little, because now technology has upgraded throughout the years, not a lot of people want old cars. So if you want cheap, buy old cars.
No, you cannot work in the US with a tourist visa.
I had a Norwegian buddy in college who owned a Honda, and every illegal immigrant can buy a car. Cars aren't restricted to US nationals.
If it's a new car, you'll need a valid US address and/or driving license.
They are often less expensive.
In the car crushing yard