Abstract: Although the US Constitution is quite short, it is also quite old. The structures it called forth – including the presidency, the bicameral Congress, the Supreme Court – survive, even as their relationships have evolved. Its brief provisions have also spawned a complex body of jurisprudence on many issues that has shifted over more than two centuries; there are now more than 560 volumes of the official ‘US Reports’, that is, of cases decided by the US Supreme Court.