and making it a suffragan of the same archdiocese, on March 3, 1868. On July 22, 1939, Pope Pius XII erected the Archdiocese of Washington, taking the territory of the District of Columbia and Montgomery, Prince George, St. Mary's, Calvert, and Charles Counties from the Archdiocese of Baltimore, and naming the archbishop of Baltimore, Michael J. Curley also the first archbishop of Washington so the two archdioceses remained united (in the person of the bishop). This action established the current territory of the Archdiocese of Baltimore. Archbishop Curly used the title of Archbishop of Baltimore-Washington during this period, although the title of the archdiocese never formally changed. Eight years later, on November 15, 1947, the same pope appointed Patrick A. O'Boyle as the second Archbishop of Washington, thus separating the jurisdictions completely. The Archdiocese of Washington thus became the only archdiocese in the United States that was not also a metropolitan see, and this status endured until Pope Paul VI elevated it to a metropolitan see, designating the Diocese of St. Thomas as its only suffragan, on October 12, 1965. The Metropolitan Archdiocese of Baltimore was the only metropolitan archdiocese in the United States from its elevation to that status on April 8, 1808, until Pope Pius IX elevated the Diocese of St. Louis to that status on July 20, 1847, so the entire country formed just one ecclesiastical province for most of that period. The same pope elevated the Diocese of Cincinnati, the Diocese of New Orleans, the Diocese of New York, and the Diocese of Oregon City to metropolitan archdioceses, on July 19, 1850, substantially reducing the area of the Metropolitan Province of Baltimore. As the nation's population grew and waves of Catholic immigrants arrived, the Holy See continued to erect new dioceses and elevate certain others to the status of metropolitan archdioceses, which simultaneously became metropolitan sees of new ecclesiastical provinces. Thus, the Province of Baltimore gradually became smaller, diminishing to the states of Delaware, Virginia, and West Virginia and the counties of Maryland that are not part of the Archdiocese of Washington. At that time, the province consisted of the Archdiocese of Baltimore, the Diocese of Richmond, the Diocese of Wheeling, and the Diocese of Wilmington. On May 28, 1974, Pope Paul VI (1) transferred the two counties of the Eastern Shore region of Virginia from the Diocese of Wilmington to the Diocese of Richmond, (2)