No one. Our founding fathers were very smart to make sure no one person have all the power. You can see it in action today with some of the things with Trump and congress. What they did IS working.
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The people hold the ultimate authority since they vote for elected officials.
The Judicial Branch of government is vested with the authority to interpret the Constitution and ensure that laws adhere to the spirit and letter of the Constitution. It is also responsible for determining how a laws are interpreted and applied.As the highest court in the nation, the US Supreme Courtis the ultimate authority on the interpretation of laws and the Constitution.However, through the system of checks and balances, the Supreme Court does not have the final say on what the Constitution is. The Congress, with the several States, has the authority to amend (change) the Constitution, thus potentially overturning a Supreme Court decision. This is a difficult and time-consuming thing to accomplish and so is not often done.
at national or central level
The people.
The Supreme Court has the ultimate say on whether something is constitutional or not.