Didn't at my law school. Other than tax law, which required a Master's in Tax after finishing your three years, I'm unaware of any "major" in law schools anywhere in the US. I guess you could take the standard contract law class that spans the entire first year and then take an upper-level class in something like government contracts and say that you "specialized" in contracts, but neither I nor any of my classmates looked at our law education that way. Of course, all the classmates I kept in touch with actually passed the bar exam, practiced law in some manner, and pretty much left their law school experiences behind by the time they turned 30.