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We like to think that courts are, and have always been, the primary and final interpreters of statutes. As the conventional separation-of-powers wisdom goes, legislatures “make” statutes while judges “interpret” them. In fact, however, legislatures across centuries of American history have thought of themselves as the primary interpreters. They blurred the line between “making” and “interpreting” by embracing a type of legislation that remains overlooked and little understood: “expository” legislation—enactments that specifically interpreted or construed previous enactments.

In the most exhaustive historical study of the subject to date, this Article—the first in a series of Articles—unearths and explains that lost tradition of legislative statutory interpretation from an institutional perspective. To do so, it draws on an original dataset of 2,497 pieces of expository legislation passed from 1665 to 2020 at the colonial, territorial, state, and federal levels—the first effort of its kind. It shows how expository legislation originated as a colonial-era British import that Americans came to rely on beyond the creation of new constitutions. Lawmakers used expository statutes to supervise administrative statutory interpretation and to negotiate interpretation in the shadows of courts. Judges accepted and even encouraged legislative statutory interpretation. In the mid-nineteenth century, judges increasingly fought back, emboldened by growing calls for judicial independence. Yet even as the backlash entered into treatises, and even as some lawmakers began to balk, legislatures and judges continued to accept and use legislative interpretations of statutes well into the nineteenth century.