Which article proclaims the constitution as the highest law?

the sixth article

Explanation:

The Constitution, the laws of Congress, and all treaties are the highest law of the land. That means that the Constitution is supreme over any state laws. Therefore, any state law that violates the provisions of the Constitution can be overturned. This clause was part of civil rights cases in the 1960s and 1970s, in deciding that state segregation laws were unconstitutional under the Civil Rights Law of 1965. All of these ideas are found in what is called the supremacy clause of Article VI.

this isn't a question and if you're going to list things be kind and use commas.

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;