When the Supreme Court decided Chevron U.S.A., Inc v. Natural Resources Defense Council, Inc. 40 years ago, it didn't turn many heads. But eventually, it became the most widely cited case in all of administrative law. It set a legal precedent to give federal agencies the benefit of the doubt when the law is ambiguous, known as Chevron deference.

Now, a recent Supreme Court decision has set in motion another tectonic shift, effectively ending that precedent. Today, we dig into what Chevron deference is and how it actually came about. Then tomorrow we'll continue our focus on this significant change by looking at the potential fallout.

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