According to the historian Raymond Kupke, O'Boyle's work at War Relief Services and his skill in dealing with governmental and non-governmental agencies during the war and postwar periods caught the attention of the apostolic delegate to the United States, Archbishop
Amleto Giovanni Cicognani. On November 27, 1947, O'Boyle was appointed archbishop of Washington by
Pope Pius XII. O'Boyle received his
episcopal consecration on January 14, 1948, from Cardinal
Francis Spellman, with Bishops John McNamara and
Henry Klonowski serving as
co-consecrators, in
St. Patrick's Cathedral in New York City. According to Wickouski, O'Boyle's view of his role was shaped by his experience as an administrator under Spellman. O'Boyle in 1948
racially integrated the Catholic schools of Washington six years before the
U.S. Supreme Court ruled
segregation in the public schools to be unconstitutional. He started with the city of Washington first and then expanded to the southern counties of Maryland in the archdiocese. The colleges and universities were integrated first, followed by the high schools and the primary schools. In 1949, O'Boyle delivered the
benediction at the inauguration ceremony of US President
Harry S. Truman. In Washington, O’Boyle consecrated the United States to the
Immaculate Heart of Mary. From 1962 to 1965, O'Boyle attended the
Second Vatican Council in Rome. He was made
Metropolitan Archbishop on October 12, 1965, upon Washington's promotion to that ecclesiastical status. On August 28, 1963, he delivered the invocation that began the
March on Washington for Jobs and Freedom. In April 1964, in the midst of the debate by the
US Congress on the
Civil Rights Act of 1964, O'Boyle chaired the Inter-religious Convocation on Civil Rights at
Georgetown University. In giving the
invocation, O'Boyle said that:There is in every man a priceless dignity which is your heritage. From this dignity flow the rights of man, and the duty in justice that all must respect and honor these rights.... ==Cardinal==