expulsion to the Secretary of State of the United States in 1922. He donated his papers to the University of Texas in 1923. In 1924, Mexican President Plutarco Elías Calles invited Buckley to return to Mexico, but instead he transferred his Pantepec Oil Company to Venezuela. Oil speculator After he transferred his company to Venezuela, Buckley fully committed himself to oil exploration, where he was one of the first to use the "farm-out" system. That entailed Buckley's making agreements with some of the largest oil companies by which they would share profits on oil found on the land in return for sharing development costs. His first major deal was made with Standard Oil during the 1930s, when a large oilfield was discovered on Pantepec's Venezuelan lands. During his career, Buckley was primarily interested in unexplored territory. In 1946 he began developing his holdings into separate companies. His operations became international with holdings in Canada, Florida, Ecuador, Australia, the Philippines, Israel and Guatemala. Death While traveling between Paris and New York City in September 1958, Buckley suffered a stroke while aboard the S.S. United States, where he was given the Viaticum or Last Rites. He died in Lenox Hill Hospital in New York City on October 5, 1958, and was buried in the Quaker Cemetery in Camden, South Carolina. References External links William F. Buckley, Sr.: An Inventory of His Papers at the Benson Latin American Collection 1881 births 1958 deaths 20th-century American businesspeople American people of Irish descent American Roman Catholics Buckley family People from Washington-on-the-Brazos, Texas Texas lawyers University of Texas School of Law alumni American people of Canadian descent American expatriates in Mexico People from San Diego, Texas Catholics from Texas