:)
Patent statistics:
http://www.uspto.gov/go/taf/us_stat.htm
So about 3 millions live patents in the USA in 2006. Each patent use convoluted language over several pages.
If you want to do business in the USA, you have to make sure you don't infringe any of these patents. Not one of them.
And business complain about state regulations?
Total state regulation is peanuts against patents.