The only way to repeal an amendment to the U. S. Constitution is with another duly ratified amendment.

Clause 2 of Article VI of the U. S. Constitution is known as the Supremacy Clause because it declares the U. S. Constitution, all federal laws made pursuant to the U. S. Constitution and all treaties made under the authority of the U. S. Constitution to be the supreme law of the United States, outweighing any state law or state constitution.

No

The 16th Amendment to the U. S. Constitution cleared the way for Income Taxes.

This level of government is REGIONAL LEVEL.