In Federalist 81, Hamilton noted that cases where “the state tribunals cannot be supposed to be impartial” would be decided in federal court. By dividing things up in this way, the Framers offered Americans the best of both worlds. Purely federal matters would belong in federal courts, and we wouldn’t have Texas treaties that conflict with New York treaties. And since diversity cases would belong in federal courts, we’d also be saved from state courts sticking it to out-of-state defendants. At the same time, letting state courts decide on purely in-state disputes would give states the
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