Question

What events in England caused the Puritans to embark on the largest single human migration of its kind in the 17th century

Answer 1

Puritans were being killed for Religious reasons. So they came to the United States to escape the religious persecutions. 

Answer 2

In the 17th century many Puritans were being killed for religious reasons. They came to the United States to escape the religious persecutions.