Explain how secularism has been reflected in our constitutional provisions.

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The First Amendment

Explanation:

The first Amendment states "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances." This doesn't express an aggressive separation of church and state, but rather a complete neutrality toward religion (and religious rights to practice).