| U.S. Library of Medicine maintainer | 35 |
| U.S. locale of the International Peace Garden | 45 |
| U.S. Marine Band leader, 1880-92 | 32 |
| U.S. mental-hygiene movement founder | 36 |
| U.S. Mint employees' newspaper? | 35 |
| U.S. national anthem's contraction | 38 |
| U.S. national anthem's fifth word | 37 |
| U.S. naturalist: 1838–1914 | 33 |
| U.S. naval historian: 1840–1914 | 38 |
| U.S. Naval Observatory residents | 32 |
| U.S. Naval Observatory's precise info | 41 |
| U.S. Navy base in Cuba, slangily | 32 |
| U.S. Navy officer who smokes a water pipe? | 42 |
| U.S. newcomer's course, perhaps | 35 |
| U.S. newcomer's language course, perhaps | 44 |
| U.S. newspaper publisher: 1858–1935 | 42 |
| U.S. Nobelist in Literature: 1938 | 33 |
| U.S. Olympic and welterweight champ | 35 |
| U.S. Olympic swimming gold medalist Torres | 42 |
| U.S. Open champ before and after Pete | 37 |
| U.S. Open champ in '94 and '97 | 38 |
| U.S. Open champion whose last name is a toy | 43 |
| U.S. Open tennis finalist eight straight years | 46 |
| U.S. Open tennis victor over Arthur: 1972 | 41 |
| U.S. Open winner of 1994 and 1997 | 33 |
| U.S. org. with over 39 million members | 38 |
| U.S. painter John ___: 1871-1951 | 32 |
| U.S. painter Mark ___: 1890-1976 | 32 |
| U.S. painter-sculptor: 1869-1953 | 32 |
| U.S. philanthropist:1867–1933 | 36 |
| U.S. poet ("The Hired Man") | 37 |
| U.S. poet who wrote "I Marry You" | 43 |
| U.S. poet who wrote "The Bridge" | 42 |
| U.S. poet-editor: 1877–1949 | 34 |
| U.S. poet-playwright: 1875–1950 | 38 |
| U.S. political movement: 1891–1904 | 41 |
| U.S. Postmaster General: 1933-40 | 32 |
| U.S. Presidency, in Jefferson's words | 41 |
| U.S. president and also chief justice | 37 |
| U.S. president during the Mexican War | 37 |
| U.S. president who sired 15 children | 36 |
| U.S. presidential campaigner's audience | 43 |
| U.S. priest-poet John Banister ___ | 34 |
| U.S. problem, according to J.E.C. | 33 |
| U.S. provider of Olympic coverage | 33 |
| U.S. rebellion leader of 1841-42 | 32 |
| U.S. rocket with a name from classical myth | 43 |
| U.S. rocket with a name from Greek myth | 39 |
| U.S. scientific satellite of the 60's | 41 |
| U.S. Secretary of State (1961-1969) | 35 |
| U.S. secretary of state raised in the Bronx | 43 |
| U.S. Secretary of State: 1898–1905 | 41 |
| U.S. senator with the longest tenure in history | 47 |
| U.S. soccer player with 158 international goals | 47 |
| U.S. social reformer: 1849–1914 | 38 |
| U.S. state capital with 13,000 people | 37 |
| U.S. state that comes first alphabetically: Abbr. | 49 |
| U.S. state where prostitution is partly legal | 45 |
| U.S. state with a secessionist movement | 39 |
| U.S. state with its own elec. power grid | 40 |
| U.S. station name retired in 1972 | 33 |
| U.S. status during the Cuban Missile Crisis | 43 |
| U.S. Steel was once its biggest employer | 40 |
| U.S. Surgeon General under Reagan | 33 |
| U.S. tennis legend on a 37¢ stamp | 36 |
| U.S. tennis star barred from South Africa | 41 |
| U.S. term for a British "saloon" | 42 |
| U.S. territory in W.W. II fighting | 34 |
| U.S. territory that's now two states | 40 |
| U.S. Triple Crown winner of 1935 | 32 |
| U.S. truck maker until the early '50s | 41 |
| U.S. unit of weight equivalent to 100 pounds | 44 |
| U.S. United Nations representative, 2005-06 | 43 |
| U.S. Vice President or Presidential candidate | 45 |
| U.S. Vice President: 1845–49 | 35 |
| U.S. Vice President: 1925–29 | 35 |
| U.S. Vice President: 1933–41 | 35 |
| U.S. visa type issued to visiting diplomats | 43 |
| U.S. watercolorist: 1870–1953 | 36 |
| U.S. women's singles champion: 1979 and 1981 | 48 |
| U.S. writer ("The Black Camel") | 41 |
| U.S. youth agency: 1935–43 | 33 |
| U.S.'s most abundant energy source | 38 |
| U.S., French and Australian tournaments | 39 |
| U.S.-born grandchild of Japanese immigrants | 43 |
| U.S.-born Japanese educated in Japan | 36 |
| U.S.-funded broadcaster, ___ Europe | 35 |
| U.S.-Mexico border crosser's goal, perhaps | 46 |
| U.S.-Mexico border town ___ Laredo | 34 |
| U.S.-Mexico-Canada commerce pact | 32 |
| U.S.-vs.-Europe golf competition | 32 |
| U.S./Canadian sporting grp. since 1936 | 38 |
| U.S.A. comes to its ___ every 10 years | 38 |
| U.S.A.F. pilot's medal: Abbr. | 33 |
| U.S.C. defeater in the 1988 Rose Bowl | 37 |
| U.S.dancer-choreographer: 1931-89 | 33 |
| U.S.M.A.'s polite invitation? | 33 |
| U.S.S. Enterprise chief engineer Geordi ___ | 43 |
| U.S.S. Enterprise crewman, to Kirk | 34 |
| U.S.S. Enterprise officer: Abbr. | 32 |