That trusts were legal in other countries
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Supreme court justices decide if laws are constitutional.
In theory, any court can decide this, but only the decisions of the US Supreme Court are binding in regards to the US constitution (for State constitutions, the state's Supreme Court is generally the final arbiter... the US Supreme Court might rule that a particular provision in a state's constitution is not compatible with the US constitution, but usually will let the state court decide for itself in strictly internal matters.)
No, The US Supreme Court is the only federal court Congress is powerless to abolish, because the Court is mandated by Article III of the Constitution.
The US Supreme Court serves as the final court of appeal
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