Where can I major in Ayurvedic medicine in the United States?

Ayurveda ‘medicine’ isn’t really medicine. As William has inferred, there’s a lot of places happy to take your money in exchange for a worthless certificate.

Try to study a recognised subject from an accreditted institution, at the very least your time and money won’t be wasted, you can use it to get a proper job with, then if you want to study any old Indian myths you can do it in your spare time. A good book should be sufficient.