Question: In between Martin v. Hunter's Lessee and Buckley v. Valeo which was the first case to assert ultimate Supreme Court authority over state courts in civil matters of federal law?
Sentence (from "Supremacy Clause"): The Supremacy Clause of the United States Constitution (Article VI, Clause 2) establishes that the Constitution, federal laws made pursuant to it, and treaties made under its authority, constitute the supreme law of the land.
Relevant evidence: No