What historical event was the context in which the American colonies became a land of religious diversity?

The Establishment clause (separation of Church and States)

Explanation:

Prior to the creation of this clause , the United States government indirectly encouraged the citizens to follow Christianity as their religion. This can be seen in their subtle legislations. Schools were banned to teach creation that's not according to bible, schools were given the power to make the students follow morning prayers, etc.

After the, Establishment Clause, the government was banned to use religious reaching as a basis to make any form of legislations. This allowed American colonies to slowly transformed into a land of religious diversity.

i am not in high school so i don’t know

the answer would be in this answer. someone already asked the question.