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The word act, as used in the term Act of Congress, is a common, not a proper noun. The capitalization of the word act is deprecated by some dictionaries and usage authorities. Some writers, in particular the U.S. Code, capitalize Act.
Capitalizing Constitutional Clauses. We know that when referring to constitutional amendments or clauses, we capitalize the clause or amendment. Thus, our First Amendment has a Free Exercise Clause, and an Establishment Clause. Our Fourteenth Amendment contains a Due Prcoess Clause and an Equal Protection Clause.