- **Born:** November 15, 1813 at sea off Gibraltar (on British warship) - **Parents:** John Thomas O'Sullivan (Irish-American diplomat and sea captain) and Mary Rowly (English gentlewoman) - **Spouse:** No record found - **Children:** No record found - **Died:** March 24, 1895 on Staten Island, New York - **Highest Office:** U.S. Minister to Portugal (1853-1857) - **Other Notable Positions:** Editor and founder of United States Magazine and Democratic Review, founder of New York Morning News, journalist, lawyer - **Party Affiliation:** Democratic Party - **Historical Note:** Coined the term "Manifest Destiny" in 1845 to justify American territorial expansion. His phrase became the ideological foundation for westward expansion and the annexation of Texas and Oregon Territory.