| United States -- History -- 20th century. Matches 43 items |
| United States -- History -- 20th century -- Biography. Matches 1 item |
| United States -- History -- 20th century -- Case studies. Matches 1 item |
| United States -- History -- 20th century -- Chronology. Matches 1 item |
| United States -- History -- 20th century -- Drama. Matches 1 item |
| United States -- History -- 20th century -- Fiction. Matches 1 item |
| United States -- History -- 20th century -- Juvenile fiction. Matches 2 items |
| United States -- History -- 20th century -- Pictorial works -- Exhibitions. Matches 1 item |
| United States -- History -- 20th century -- Sources. Matches 1 item |
| United States -- History -- 20th century -- Study and teaching. Matches 1 item |