Answer: Establishment Clause
The Establishment Clause is part of the First Amendment to the United States Constitution. It is also part of the constitutional right of freedom of religion (along with the Free Exercise Clause). The clause states that Congress does not have the power to make laws respecting an establishment of religion, or prohibiting the free exercise thereof. This was a particularly important protection in the United States as the country was populated by people who were escaping religious persecution in Europe.