I'm not sure that's the case. It seems more likely that other legal systems are starting to mature, and so they're naturally citing their own precedent more often. 50 or 100 years ago, there just wasn't the body of, say, Canadian law that there is today. On the other hand, since the Warren Court the decisions of the Supreme Court have become increasingly narrow. This is based on the notion that the Court should only decide those issues it has to to reach a decision in the case, and also on the idea that all of the great Constitutional decisions have already been made. We largely agree on what the Constitution means, we just disagree about the details. But these narrow decisions about the details are less useful to other countries with different constitutions and different bodies of common law.
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"Die Deutschen meinen, daß die Kraft sich in Härte und Grausamkeit offenbaren müsse, sie unterwerfen sich dann gerne und mit Bewunderung:[...]. Daß es Kraft giebt in der Milde und Stille, das glauben sie nicht leicht."
"The Germans believe that power must reveal itself in hardness and cruelty and then submit themselves gladly and with admiration[...]. They do not believe readily that there is power in meekness and calm."
-- Friedrich Nietzsche
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