1. United States explorer who (with Meriwether Lewis) led an expedition from St. Louis to the mouth of the Columbia River; Clark was responsible for making maps of the area (1770-1838)
2. United States general who was Allied commander in Africa and Italy in World War II and was commander of the United Nations forces in Korea (1896-1984)
3. United States psychologist (born in Panama) whose research persuaded the Supreme Court that segregated schools were discriminatory (1914-)
4. Canadian politician who served as prime minister (1939-)