What is the primary purpose of the Supremacy Clause?
Answers
The supremacy clause (article 4, section 2 of the constitution), establishes that federal law, supreme court decisions, and US treaties — i.e., anything decided on a national level — supersedes anything decided on a state or local level. The point is to make sure that states do not subvert national interests. For instance, if the US goes to war with another nation and sets up a trade embargo, and individual state should not be allowed to pass laws which allow it to trade with the enemy; that would damage the ability of the nation to fight its war.
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It isolates control amongst state and national governments.
What is the main role of the Supremacy Clause? Congress will have capacity to make all Laws which will be important and appropriate for conveying into Execution the prior Powers.
The main role of the Supremacy Clause to protect that states don't mishandle the power they have.