The late 18th and early 19th centuries saw Americans leaving the Eastern Seaboard to settle further inland. One of the results was that the PCUSA signed a Plan of Union with the Congregationalists of New England in 1801, which formalized cooperation between the two bodies and attempted to provide adequate visitation and preaching for frontier congregations, along with eliminating rivalry between the two denominations. The large growth rate of the Presbyterian Church in the Northeast was in part due to the adoption of Congregationalist settlers along the western frontier.