Every 10 years
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.
The 17th Amendment, ratified in 1913, changed the method of electing US senators.
The Seventeenth Amendment
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Direct taxes are illegal in the united states unless everyone is taxed at the same rate.
100, 2 from each state, make up the United States Senate.