United States Foreign relations 5,249
United States Politics and government 2,974
United States History 2,815
United States 2,041
United States Foreign economic relations 1,739
United States Economic conditions 1,406
Uranium ores 1,182
United States Appropriations and expenditures 823
United States Economic policy 816
United States Military policy 777
United States Armed Forces Appropriations and expenditures 690
United States Social conditions 654
United States Military relations 611
United States Armed Forces 535
United States Race relations 501
United States Commerce 472
United States Relations 469
United States Civilization 468
United States Commercial policy 428
United States Emigration and immigration 413
User interfaces (Computer systems) 383
United States Armed Forces Operational readiness 378
United States Social life and customs 374
Utah 336
United States Emigration and immigration Government policy 335
U.S. states Politics and government 330
United States Armed Forces Military construction operations Law and legislation 300
United States Population 290
Ubiquitous computing 285
User-centered system design 279
Uranium 273
Urbanization 264
Unemployment 260
Universities and colleges 255
United States Description and travel 252
United States Defenses 234
United States Armed Forces Procurement 216
United States History Campaigns 203
United States Foreign relations Law and legislation 202
United States History, Military 190
United States Social policy 184
Uncertainty (Information theory) 173
United States Religion 167
Uranium mines and mining 162
United States Officials and employees 159
United States Officials and employees Selection and appointment 158
United States Appropriations and expenditures, 2000 148
Urban policy 148
United States Intellectual life 146
United States Territorial expansion 145
Unemployment insurance 141
United States Appropriations and expenditures, 2001 140
United States Appropriations and expenditures, 2013 140
Urban runoff 135
United States Armed Forces Personnel management 134
United States Armed Forces Medical care 131
United States Discovery and exploration 130
United States Appropriations and expenditures, 2006 129
United States Appropriations and expenditures, 2012 127
United States Officials and employees Salaries, etc 126
Urban renewal 126
United States Appropriations and expenditures, 2005 125
United States Church history 125
United States Appropriations and expenditures, 2007 121
United States Appropriations and expenditures, 1998 120
Urban ecology (Sociology) 119
United States Appropriations and expenditures, 1999 117
Universities and colleges Administration 116
United States History Study and teaching 115
United States Race relations History 115
United States Appropriations and expenditures, 2004 113
United States Appropriations and expenditures, 2008 113
United States Appropriations and expenditures, 2016 113
United States Officials and employees Legal status, laws, etc 113
United States Appropriations and expenditures, 2002 111
United States Appropriations and expenditures, 2014 111
United States Appropriations and expenditures, 2017 111
United States Emigration and immigration History 109
United States History Causes 108
Universities and colleges Finance 105
United States Appropriations and expenditures, 1996 104
United States Boundaries 104
United States Appropriations and expenditures, 2015 103
User charges Law and legislation 99
United States Ethnic relations 98
United States Appropriations and expenditures, 2003 97
United States Appropriations and expenditures, 2011 97
Urban geography 96
United States Armed Forces Personnel management Law and legislation 95
United States Appropriations and expenditures, 2010 94
Universal jurisdiction Government policy 92
United States Foreign relations administration 88
Ukraine Foreign relations 87
United States Armed Forces Recruiting, enlistment, etc 87
United States Armed Forces Pay, allowances, etc 86
United States Appropriations and expenditures, 2009 84
Unified operations (Military science) 82
United States Armed Forces Pay, allowances, etc. Law and legislation 82
Unemployed 81
Urban economics 78