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| | United States |
 | | The United States also holds several other territories, districts and possessions, notably the federal district of the District of Columbia, which is the nation's capital, and several overseas insular areas, the most significant of which are Puerto Rico, American Samoa, Guam and the United States Virgin Islands. |
 | | The social structure of the United States is highly stratified, with a large proportion of the wealth of the country controlled by a small fraction of the population which exerts disproportionate cultural and political influence on the rest of the nation. |
 | | The United States is also a great center of higher education, boasting more than 1,500 universities, colleges, and other institutions of higher learning, the top tier of which may be considered to be among the most prestigious and advanced in the world. |
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