Compulsory counterclaim rule in states of USA
“A counterclaim is any affirmative claim for relief asserted by a pleader—typically the defendant—in the defensive pleadings against an opposing party—typically the plaintiff.” (Friedenthal, Jack H., Kane, Mary K., and Miller, Arthur R, p. 354) In accordance with Federal Rules of Civil Procedure for the United States District Courts (Rule 13 a)
A pleading must state as a counterclaim any claim that–at the time of its service–the pleader has against an opposing party if the claim:
(B) does not require adding another party over whom the court cannot acquire jurisdiction.
… over 40 states had adopted a compulsory counterclaim rule.
He didn’t cite their names. I searched the web and found two files in one of them, the list of those states existed. It was a report from Advisory Committee on Rules of Court (October 1, 2007).