The United States is distinct among nations in its constitutionalization of personal jurisdiction. This Note explains the intertwined history of U.S. specific jurisdiction law and the so-called “Hague Judgments Project,” which is facilitating negotiations toward a treaty regulating recognition and enforcement of foreign judgments. This Note argues that the constitutionality of any such proposed treaty will remain uncertain unless U.S. courts clarify existing personal jurisdictional doctrine, particularly regarding the “jurisdictional filters” question: May U.S. courts lawfully recognize and enforce a foreign judgment issued upon a jurisdictional basis that would have been unconstitutional in domestic litigation? This Note answers “yes,” at least when the foreign court’s exercise of personal jurisdiction is compatible with internationally accepted norms. By proposing a cogent response to this question, this Note hopes to facilitate the negotiation and adoption of a future judgments convention.