Which factor contributed to the founding of new religious groups in the united states

The first amendment is the most important factor that has contributed to the founding of new religios groups in the United States.

Explanation:

This is because the first amendment grants the freedom of religion in the Unietd States, What this means is that in America, people can follow any religion that they wish. People also can found any religion. Technically, a person could found a new religion and be its only follower.

Because of this constitutional protection, in America many new religions have emerged: Mormonism, Adventism, Jehova's Witnesses, etc.