I believe the US is one of 7 countries in the world that _don't_ have minimum vacation days (although I believe individual states could/do have their minimums?).

The others are (per Wikipedia):

* Kiribati

* Marshall Islands

* Micronesia

* Nauru

* Palau

* Tonga

That said, your ability to actually _enforce_ your right to minimum holidays is going be pretty variable.