 After returning in 1774 to live on the Rock Creek in Maryland, Carroll established Saint John the Evangelist Church, in Silver Spring, Maryland.In 1776, his cousin, Charles Carroll, a signer of the Declaration of Independence, invited John to join him, Samuel Chase, and Benjamin Franklin in traveling to Quebec and attempt to persuade the French Canadian population to join the revolution.The mission was unsuccessful, but John Carroll's association with Benjamin Franklin proved useful.