What is that makes the USA a greenhouse for new organized religions?

Just look at this list; Mormonism, Scientology, Jehovah’s Witness, Raelian, Exclusive Brethren, creationism…all these new religions were born in the USA. They have now spread all over the world like seeds blown by a wind. Anybody have any theories as to why the USA more than any other nation produces new organized religions like this?