Cite as: 531 U. S. 497 (2001)
Opinion of the Court
claim preclusive. While we agree that this would be the result demanded by Dupasseur, the case is not dispositive because it was decided under the Conformity Act of 1872, 17 Stat. 196, which required federal courts to apply the procedural law of the forum State in nonequity cases. That arguably affected the outcome of the case. See Dupasseur, supra, at 135. See also Restatement (Second) of Judgments § 87, Comment a, p. 315 (1980) (hereinafter Restatement) ("Since procedural law largely determines the matters that may be adjudicated in an action, state law had to be considered in ascertaining the effect of a federal judgment").
Respondent, for its part, contends that the outcome of this case is controlled by Federal Rule of Civil Procedure 41(b), which provides as follows:
"Involuntary Dismissal: Effect Thereof. For failure of the plaintiff to prosecute or to comply with these rules or any order of court, a defendant may move for dismissal of an action or of any claim against the defendant. Unless the court in its order for dismissal otherwise specifies, a dismissal under this subdivision and any dismissal not provided for in this rule, other than a dismissal for lack of jurisdiction, for improper venue, or for failure to join a party under Rule 19, operates as an adjudication upon the merits."
Since the dismissal here did not "otherwise specif[y]" (in-deed, it specifically stated that it was "on the merits"), and did not pertain to the excepted subjects of jurisdiction, venue, or joinder, it follows, respondent contends, that the dismissal "is entitled to claim preclusive effect." Brief for Respondent 3-4.
Implicit in this reasoning is the unstated minor premise that all judgments denominated "on the merits" are entitled to claim-preclusive effect. That premise is not necessarily valid. The original connotation of an "on the merits" adjudication is one that actually "pass[es] directly on the substance
501
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