| 1 | U boats | 820 |
| 2 | U-boats | 1770 |
| 3 | U.S History | 765 |
| 4 | U.S Imperialism | 477 |
| 5 | U.S. Expansion into the West | 672 |
| 6 | U.S. Foreign Policy 1900-1941 | 3193 |
| 7 | U.S. Grant | 2065 |
| 8 | U.S. Imperialism | 1116 |
| 9 | U.S. in the 1920s | 541 |
| 10 | U.S. Intervention in Russia 1918-1922 | 814 |
| 11 | U.S. Involvement in World Affairs | 342 |
| 12 | U.S. Involvement In WWII | 1088 |
| 13 | U.s. Mexico Border Issues | 886 |
| 14 | U.S. Military Presence Overseas | 767 |
| 15 | U.S. Navy Seals | 3430 |
| 16 | U.S. Out of Iraq | 799 |
| 17 | U.S.'s Decision to drop atomic bombs | 1120 |
| 18 | UK and US Constitution Compared | 1978 |
| 19 | ullysses life | 259 |
| 20 | Uluru | 264 |
| 21 | Ulysses | 711 |
| 22 | Ulysses Grant | 1034 |
| 23 | Ulysses S Grant | 2116 |
| 24 | Ulysses S. Grant | 556 |
| 25 | Ulysses S. Grant | 825 |
| 26 | Ulysses S. Grant | 285 |
| 27 | Umatilla | 1778 |
| 28 | Uncle Tom;s Cabin | 161 |
| 29 | Uncle toms cabin and dred scott decision | 308 |
| 30 | Uncommon Race, Common Love | 563 |
| 31 | Underground Railroad | 837 |
| 32 | Underground Railroad | 333 |
| 33 | Underground Railroad | 277 |
| 34 | Underground Railroad | 1428 |
| 35 | Underground Railroad | 3403 |
| 36 | Unemployment in 20th Century britain Based on Gender and Age | 1787 |
| 37 | Unfication of the American Colonies before the Revolution | 991 |
| 38 | Unforgettable Change | 268 |
| 39 | Unfulfilled Expectations Were Crucial In Causing The Revolut | 973 |
| 40 | Unification | 490 |
| 41 | Unification of Germany | 1379 |
| 42 | Unification of Germany | 1594 |
| 43 | Unification of the Colonies | 560 |
| 44 | Union Development | 2529 |
| 45 | Union Station | 464 |
| 46 | Union Strength Within Progressive Era | 363 |
| 47 | Union Victory At Shiloh | 1838 |
| 48 | Unionization of the UMWA | 2162 |
| 49 | United Nation | 1379 |
| 50 | United Nations | 432 |
| 51 | United States & the Great War | 1910 |
| 52 | United States and the love for your country | 641 |
| 53 | United states and Vietnam | 510 |
| 54 | United States History | 1277 |
| 55 | United States into World War I | 790 |
| 56 | United States Presidents | 1109 |
| 57 | United States Symbols | 901 |
| 58 | United States Under Seige | 883 |
| 59 | United States v. New York Times | 1711 |
| 60 | United We Stand; Divided We Fall | 1389 |
| 61 | Unity and Identity of U.S. before Revolution | 1177 |
| 62 | Uniuniting Walls | 1445 |
| 63 | University of Calif v Bakke | 365 |
| 64 | Unkindest Cut | 701 |
| 65 | Unredeemed | 697 |
| 66 | unredeemed | 908 |
| 67 | Unredeemed Captive | 517 |
| 68 | Unredeemed Captive | 965 |
| 69 | Unsafe Working Conditions | 677 |
| 70 | Untold History : Critique of Joe Feagins, Racist America | 2438 |
| 71 | Up lift on the reconstruction of african american | 826 |
| 72 | Upon The Burning of Our House | 322 |
| 73 | Upstair Room | 967 |
| 74 | Urban Problems | 1400 |
| 75 | Urban Sprawl | 1523 |
| 76 | Urbanization | 388 |
| 77 | US Coloines | 353 |
| 78 | US Constitution | 741 |
| 79 | US Constitution | 847 |
| 80 | US entering WWII | 1261 |
| 81 | US Government | 875 |
| 82 | US History | 665 |
| 83 | US History | 1078 |
| 84 | Us History | 512 |
| 85 | US history 1920 | 884 |
| 86 | Us History Economics | 1200 |
| 87 | US Imperialism | 1174 |
| 88 | US imperialism and the panama canal | 2823 |
| 89 | US In WW1 | 609 |
| 90 | US Interest WW1 | 716 |
| 91 | US Intervention In Italy:1948 Elections | 2795 |
| 92 | US Intervention in Latin America | 3500 |
| 93 | US Invasion of Cambodia | 758 |
| 94 | US Invasion of Japan | 378 |
| 95 | US Reacts To Holocaust | 2419 |
| 96 | US supreme court cases | 378 |
| 97 | Us-Mexico | 2200 |
| 98 | US-ROK relations | 2500 |
| 99 | US/Australian Alliance | 1939 |
| 100 | usa | 1188 |
| 101 | USA Has Seperation of Powers While New Zealand Has Supremcy | 466 |
| 102 | USA Patriot Act | 1074 |
| 103 | Use of Gestures in the Medieval Society | 634 |
| 104 | USS Arizona | 1092 |
| 105 | USS Constitution | 953 |
| 106 | Utopia | 311 |
| 107 | Utopia | 641 |