The United States of America in 1845

In 1845, the territorial realm of the United States included the following areas:

The Original Thirteen Colonies: The eastern seaboard, where the original thirteen British colonies had been established and eventually became the first states of the United States.

Louisiana Purchase: The United States had acquired a vast territory through the Louisiana Purchase in 1803, which extended from the Mississippi River to the Rocky Mountains and roughly doubled the size of the country.

Florida: Florida was acquired from Spain in 1819 through the Adams-Onís Treaty.

Oregon Country: The Oregon Country was a jointly administered region with Britain under the Treaty of 1818. The U.S. settled the northern boundary at the 49th parallel in 1846, securing the southern portion.

Texas: Annexation of the Republic of Texas occurred in 1845. This move led to tensions with Mexico, as they did not recognize Texas as part of the United States.

The United States was expanding westward during this period, and the issue of whether newly acquired territories would allow slavery or not was a source of significant political tension and would eventually contribute to the outbreak of the American Civil War in 1861.