One problem that many of us have is that so much of "the Constitution" is defined in case law instead of the actual text of the document. The courts, and only the courts, have power to interpret the constitution, but their interpretation can go into minute detail on every aspect of every branch of government. The consequence is that if a public school teacher says something about religion, it might take a Supreme Court ruling to determine whether or not that teacher's comment was legal. That's a pretty uniquely American phenomenon, and it comes from the fact that only in America is the Constitution held to be so powerful, but the power to interpret it is held to rest in the hands of nine individuals. Also as a side effect of that, the Supreme Court gets to be kind of like the "replay judge". (I don't know if that's a metaphor unique to American Football, or not.) After the Congress agrees to a policy, and the President signs it, there's still a chance that it just won't happen, because if the nine members of the Supreme Court find some sort of legal reason for rejecting it, the law will be overturned, and there's no way to overturn a Supreme Court ruling short of a constitutional ammendment, which is very difficult. I think in every other country, the legislature has at least some chance to throw out a court ruling, but in America, there is no such chance.
I think this was a very good answer. But it's worth noting that while the Supreme Court gets the final word on what the Constitution means, they do not decide every constitutional issue. There are 13 Federal Appellate Courts (and 94 federal district courts) that handle most constitutional questions. The Supreme Court has discretionary appellate jurisdiction and, if I remember correctly, usually takes less than 200 of the 10,000 or so requests for review it receives each year.
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