“…On the former point, it seems clear that prior to 1875-and to some extent even after-the federal courts used diversity jurisdiction to enforce claims and defenses based on federal law, sometimes in suits involving state officials (Woolhandler 1997).81 Moreover, to a lesser extent the lower courts asserted federal authority and enforced national policy in exercising their admiralty jurisdiction, relatively speaking a more important jurisdiction prior to the Civil War than subsequently (Freyer and Dixon 1995, 31-36;Morris 1987, 16-18, 63-64).82 On the latter point, recent histories confirm that private law diversity actions continued to dominate most federal dockets until at least World War I (e.g., Zelden 1993, 60;Couch 1984, 36;Solomon 1981, 76;Hall and Rise 1991, 145;Freyer and Dixon 1995, 207) and that they remained a major category of federal litigation throughout the twentieth century (Hall and Rise 1991, 146;Zelden 1993, 193-94;Couch 1984, 108-9). Moreover, the idea of diversity jurisdiction as a broad, vibrant, and essential tool of American nationalism found one of its greatest Kakalik et al 1996a;1996b;1996c;1996d). For a statistical historical analysis of the changing federal caseload, see Clark 1981. 81.…”