The Catholics in Great Britain's thirteen colonies…
November 1784 CE
After the Treaty of Paris, signed September 3, 1783, ended the war, Maryland clergy had delivered a petition to the Holy See, on November 6, 1783, for permission for the missionaries in the United States to nominate a superior who would have some of the powers of a bishop.
In response, Pope Pius VI on June 6, 1784, confirms Father John Carroll, who had been selected by his brother priests, as Superior of the Missions in the newly independent thirteen United States of North America, with power to give the sacrament of confirmation
This act establishes a hierarchy in the United States and removes the Catholic Church in the U.S. from the authority of the Vicar Apostolic of the London District.
The Holy See now establishes the Apostolic Prefecture of the United States on November 26, 1784.