I had no idea how you got to 9, so I looked on wiki:
http://en.wikipedia.org/wiki/Public_holidays_in_the_United_States
http://en.wikipedia.org/wiki/Public_holidays_in_the_Netherlands
The list is a bit confusing, since some holidays consist of two days (which, as far as I know, is typically dutch): we get two days of Easter, Pentecost and Christmas. The first day of Easter and Pentecost is always on a Sunday though, so I'm not counting that. Christmas definately is two days off though. But Good Friday, St. Nicholas and Liberation Day don't mean you get a day off. So it's actually 7 days off. Unless you work in a store and work on a sunday, then you do get a day off on the sundays of Christmas and Easter... but supermarkets and furniture stores are open on the mondays of Christmas and Easter.
I just recalled that for many years the final of the national football cup (we have a cup and a competition, which is not the same thing) was at Ascension Day, but a few years ago the final was moved up in the calendar so it wouldn't be weeks after the end of the competition. Nobody knows why Ascension Day exists anymore.
Anyway, my point was that we don't have a lot of holidays besides religious holidays. Only King's Day is a holiday. Many other countries have something like Labor Day on the 1st of May for example, but we don't. Some countries celebrate the end of WWI, but we don't (since we dodged that). There's no unification day (because we didn't get invaded by Russians), no discovery day (because we're not in the new world), and nobody that ever got shot is worth remebering, apparently. There's a a lot of commercial crap pushing festivities like Valentine's day, Mother's day and Father's day though, and even Halloween has taken root over the last decade or so.