| United States -- Civilization -- 20th century. Matches 44 items |
| United States -- Civilization -- 20th century -- Encyclopedias. Matches 1 item |
| United States -- Civilization -- 20th century -- Fiction. Matches 1 item |
| United States -- Civilization -- 20th century -- Philosophy. Matches 1 item |
| United States -- Civilization -- 21st century. Matches 11 items |
| United States -- Civilization -- 21st century -- Encyclopedias. Matches 5 items |
| United States -- Civilization -- 21st century -- Forecasting. Matches 1 item |
| United States -- Civilization -- African American influences. Matches 5 items |
| United States -- Civilization -- African American influences -- Encyclopedias. Matches 1 item |
| United States -- Civilization -- African American influences -- Juvenile literature. Matches 1 item |