The Maroonbook is the University of Chicago Law Review's alternative to The Bluebook. Subject to some minor exceptions, it instructs users against using periods for the abbreviations in case names and citations. Hence, one refers to:
United States v Lopez, 514 US 549 (1995).
And not: United States v. Lopez, 514 U.S. 549 (1995).
Yes, that's right—the period is omitted even after the "v" that separates the names of the parties.
As terrible as The Bluebook is, I'll take it over the (admittedly simpler) Maroonbook.
My school teaches the
ALWD Citation Manual in first-year. Then subsequently requires
Bluebook for journal writing. Why? Because my school is backwards. After first-year, most classes give you a choice between
ALWD or
Bluebook. I always choose
Bluebook because I think it's most logical to go along with the rest of the country.
As for the thread topic...I use U.S., but will use US informally like when posting on a forum.