| U.S. research rocket | 20 |
| U.S. research org. | 18 |
| U.S. regulatory org. since 1935 | 31 |
| U.S. regulatory board | 21 |
| U.S. regulatory agcy. | 21 |
| U.S. region that's growing? | 31 |
| U.S. reformer | 13 |
| U.S. reconnaissance satellite | 29 |
| U.S. rebellion leader of 1842 | 29 |
| U.S. rebellion leader of 1841-42 | 32 |
| U.S. rebellion leader | 21 |
| U.S. real estate deal: 1853 | 27 |
| U.S. ranch bird, nowadays | 25 |
| U.S. railroad, for short | 24 |
| U.S. rail service | 17 |
| U.S. rail | 9 |
| U.S. radio station in Berlin | 28 |
| U.S. radio service | 18 |
| U.S. radio arm that broadcasts in Burmese, among other languages | 64 |
| U.S. Quaker leader | 18 |
| U.S. purchase of 1867 | 21 |
| U.S. publishing family | 22 |
| U.S. publisher: 1858-1935 | 25 |
| U.S. publisher | 14 |
| U.S. publicans | 14 |
| U.S. public health agcy. | 24 |
| U.S. psychologist-pediatrician | 30 |
| U.S. psychologist Arnold ___ | 28 |
| U.S. provider of Olympic coverage | 33 |
| U.S. property manager | 21 |
| U.S. problem, according to J.E.C. | 33 |
| U.S. prison org. | 16 |
| U.S. priest-poet: 1845-1909 | 27 |
| U.S. priest-poet John Banister ___ | 34 |
| U.S. press org. | 15 |
| U.S. Presidents | 15 |
| U.S. presidential campaigner's audience | 43 |
| U.S. president, at times | 24 |
| U.S. president, 1909-13 | 23 |
| U.S. president, 1861-1865 | 25 |
| U.S. president, 1861 to 1865 | 28 |
| U.S. president's title | 26 |
| U.S. president's command | 28 |
| U.S. President William Howard | 29 |
| U.S. president whose mother's first name was Stanley | 56 |
| U.S. president who sired 15 children | 36 |
| U.S. President who inaugurated baseball's 7th inning stretch, allegedly | 75 |
| U.S. president during the Mexican War | 37 |
| U.S. president and also chief justice | 37 |
| U.S. president after Grant | 26 |
| U.S. president #2 | 17 |
| U.S. President | 14 |
| U.S. Presidency, in Jefferson's words | 41 |
| U.S. Pres., militarily | 22 |
| U.S. power org. | 15 |
| U.S. power facility | 19 |
| U.S. power complex | 18 |
| U.S. power agency | 17 |
| U.S. power agcy. | 16 |
| U.S. Postmaster General: 1933-40 | 32 |
| U.S. possession since 1898 | 26 |
| U.S. possession | 15 |
| U.S. portrayer of flappers | 26 |
| U.S. portrait painter | 21 |
| U.S. port, or its locale | 24 |
| U.S. port of entry in Tex. | 26 |
| U.S. port | 9 |
| U.S. pollution controller | 25 |
| U.S. political scandal involving a fictional sheik | 50 |
| U.S. political party | 20 |
| U.S. political movement: 1891–1904 | 41 |
| U.S. poet: 1899–1932 | 27 |
| U.S. poet: 1898–1943 | 27 |
| U.S. poet: 1889-1973 | 20 |
| U.S. poet-playwright: 1875–1950 | 38 |
| U.S. poet-editor: 1877–1949 | 34 |
| U.S. poet, ___ Lazarus | 22 |
| U.S. poet who wrote "The Bridge" | 42 |
| U.S. poet who wrote "I Marry You" | 43 |
| U.S. poet Millay | 16 |
| U.S. poet laureate _____ Dove | 29 |
| U.S. poet Francis | 17 |
| U.S. poet and religious writer | 30 |
| U.S. poet and baseball fan | 26 |
| U.S. poet ("The Hired Man") | 37 |
| U.S. poet | 9 |
| U.S. plot? | 10 |
| U.S. playwright: 1906–63 | 31 |
| U.S. playwright: 1904-61 | 24 |
| U.S. playwright's family | 28 |
| U.S. playwright James | 21 |
| U.S. playwright Augustin | 24 |
| U.S. playwright | 15 |
| U.S. pioneer | 12 |
| U.S. pint's 16 | 18 |
| U.S. pianist of 1800's | 26 |
| U.S. physicist Alfred ___ | 25 |
| U.S. physicist | 14 |
| U.S. philosopher-essayist | 25 |
| U.S. philosopher | 16 |