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O’Hara, James (?1752–16 December 1819), revolutionary war officer, businessman, and manufacturer, was born in County Mayo, Ireland, the son of Major John O’Hara. (His mother’s name is not known.) The young O’Hara left Ireland in 1765 to attend the Jesuit College of St. Sulpice in Paris. In 1770 he briefly served in the Regiment of the British Coldstream Guards. The next year he resigned the ensign’s commission granted to him by his relative, Lord Tyrawley, and briefly worked in a ship broker’s office in Liverpool, acquiring business skills....