The law. State sovereignty has been eroded to the point that any law/regulation you come across in daily life is as likely to be federal as state (or the federal government using states as their agents).
Walk into a store and you'll see notices posted about federal and state employment laws. Buy a song on itunes, and you're presented with pages upon pages of contract language, most of which is made relevant by our laws. Buy food and it has to be regulated by the FDA. Buy stocks and your broker has to be regulated by the SEC. Go to college and get financial aid from the government.
--
Congratulations to SuperNiceDog, Guru Winner, who was smart enough to pick
your 7 time champion, Link.