Loustu - Clanad gave you all the information you really need I think.
Normally the larger companies - like General Mills - give longer vacations with length of employment. Some small companies don't give any paid vacations at all - but will usually allow an employee to take unpaid time off - but will usually give you a couple of paid days off in November for Thanksgiving and in December for Christmas.
As Clanad says, we don't have any laws that require paid vacations.
This will tell you what the typical holidays are in the US:
http://en.wikipedia.org/wiki/US_holidays
I think the thing about living in the USA is that we are such a diverse country, there is so much to see and do here, we don't do as much traveling as the rest of the world. And of course you know we are such an arrogant country that a lot of us think we could never go anywhere else that would be better than here:)
While we have pros and cons like any other country - I think if you move here with an open mind, you just might find that you really enjoy it!!!