Answer:
The Supreme Court has final appellate jurisdiction in all cases arising under the Constitution, so the Supreme Court has the ultimate authority to decide whether statutes are consistent with the Constitution.
Explanation:
The idea is known as the Republican form. The idea is that people democratically elect those who would represent them in a government, and those people would be held accountable for what they've done if they do something opposite to the will of the people. It's the only way that a democracy can work properly because others would be impossible with that many people.