One of the most neglected tools for understanding the Constitution is also one of the most important: The Law of the 18th century.

The Constitution is a legal document. It was written mostly by lawyers. It was explained to the ratifying public mostly by lawyers. And that public was exceptionally well-versed in law: As Edmund Burke pointed out in his 1775 speech on Reconciliation with America, โ€œIn no country perhaps in the world [as America] is the law so general a study.โ€ And while most of the Constitution is written in straightforward lay language, it does contain some important legal terms of art.

Yet very few writers on the Constitution โ€“ even law professors โ€“ have made much of an effort to access 18th century law.

Here are a few examples of constitutional words and phrases that writers on the Constitution have puzzled overโ€”and often misunderstood. And unnecessarily misunderstood, because each of these words and phrases had just one or two clear and accepted meanings in 18th century law and legal documents:

* Advice and Consent

* Commerce

* Due Process

* Habeas Corpus

* High . . . Misdemeanors

* Necessary and Proper

* Privileges and Immunities

* Aid and comfort

* Law of Nations

* Ex post facto

* Bill of Attainder

You can find out what some of these meant by checking out Constitutional Nuggets. You can learn about the rest from my new book, The Original Constitution: What It Actually Said and Meant.

If youโ€™d like to know more about how to access 18th century law, check out Forgotten Treasures: Reseaching the Original Understanding of the U.S. Constitution.

cross-posted from the Independence Institute’s “Our American Constitution” blog.

Rob Natelson
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