What political tool emphasizes that the U. S. Constitution and acts of Congress, as well as U. S. treaties, must prevail over state constitutions and laws enacted by state legislatures?

Supremacy Clause.

Explanation:

Supremacy Clause is mentioned in the Article fourth, paragraph second and  specifies federal law prevail over state laws. It forbids states from intervening with the  constitutional powers by the central government, and from taking on any functions that are entrusted specifically to the federal government. This states that State laws are bound by the supreme law.

the historians cited in the article all agree with one another about the cause of the civil war. despite coming from different backgrounds and cultures, the historians agree that slavery was the root cause of the civil war. the fact that all these historiansgenerally agree with one another makes their shared viewpoints more reliable and valid, especially because the historians have different backgrounds and all work for the well-respected institutions of howard university, clemson university, and the university of colorado.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.