In 1971, the 26th Amendment set the legal voting age at 18 for both US federal and state elections.
The President appoints federal judges, including Supreme Court justices, with the advice and consent of the Senate. That means the Senate must approve the President's nomination by a simple majority vote before the appointment process can be completed.
Article VI, Clause 2 (the Supremacy Clause) states the US Constitution and federal laws and treaties made in accordance with the Constitution are the supreme law of the land.
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The Treasury Department has the responsibility for formulating an international tax policy.