United States: Map & Borders Over Time
United States appears on 9 of the 39 border maps, from 1815 to 2010. Its mapped territory was largest in 1920, at roughly 9.38 million km². Chronica Maps groups it with the United States lineage, shown in the same colour across periods.
Open 1920 in the interactive map
Territory of United States over time
Approximate area on each border map.
| Map year | Approx. area | Change |
|---|---|---|
| 1815 | 5.64 million km² | – |
| 1914 | 9.38 million km² | +66% |
| 1920 | 9.38 million km² | +0% |
| 1930 | 9.38 million km² | +0% |
| 1938 | 9.38 million km² | 0% |
| 1945 | 9.38 million km² | 0% |
| 1960 | 9.38 million km² | +0% |
| 1994 | 9.38 million km² | +0% |
| 2010 | 9.38 million km² | +0% |