Map of the states and territories of the United States as it was from 1820 to July 1821. On March 16 1820, the northern district of Massachusetts was admitted as the state of Maine. On July 10 1821, the Treaty of 1819 enters in to effect, settling all disputes with the Spanish colonies; the borders were defined in the west, and both Floridas were ceded to the United States, having been purchased as part of the treaty.
{{Information| |Description=Map of the states and territories of the United States as it was from |Source= |Date= |Author=Made by User:Golbez. |Permission=Own work, attribution required (Multi-license with GFDL and Creative Commons CC-BY 2.5) |other_