<span>A shift in the gold trade is what led to a decline in Great Zimbabwe
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United States v. Nixon is considered a crucial precedent limiting the power of any U.S. president to claim executive privilege.
<span>The correct answer is the federal system. Power is shared between the two governments and states have the right to make their own laws as long as they're not unconstitutional or against the federal law. Federal law applies to all the states in a federation, like the United States has in the congress.</span>