A map of territory claimed by Texas when admitted into the Union in 1845. The map is coded to show the frontiers of Texas with the United States and Mexico, and the disputed territory in the west between the Rio Grande and Nueces rivers.

A map of Mexico and Texas from the annexation of the Republic of Texas by the United States (1845) to the end of the Mexican-American War (1848). The map is color-coded to show the territory of Texas in 1845, the territory of dispute...

A map from 1911 of the United States showing the territorial acquisitions from the original states and territory established in 1783 to the Tripartite Convention of 1899 in which Germany and the United States divided the Samoan...

A map from 1885 of the United States showing the territorial growth from the original States and the Northwest Territory in 1783 to the Russian cession of Alaska in 1867. The map is color-coded to show the progression from the original...

A map from 1897 of the United States showing the territorial growth from the original States and the Northwest Territory in 1783 to the purchase of Alaska from Russia in 1867. The map is color-coded to show the progression from the...

A map from 1897 of the United States showing the territorial growth from the original States and the Northwest Territory in 1783 to the purchase of Alaska from Russia in 1867. The map is color-coded to show the progression from the...

A map from 1911 of the United States showing the territorial growth from the original States and the Northwest Territory in 1783 to the Gadsden Purchase of 1853. The map is color-coded to show the progression from the original thirteen...

A map from 1894 of the United States showing the territorial growth from the original States and the Northwest Territory in 1783 to the Russian cession of Alaska in 1867. The map is color-coded to show the progression from the original...

A map from 1920 of the United States and its territories between 1783 and 1900 showing the nation's expansion and date of acquisition of each new territory or possession. The map is color-coded to show the progression from the original...

Here's a map to show you when states were added to the Union. It also shows territories and when they were acquired.

A map of North America in 1840 at the time when the concept of "Manifest Destiny" was being applied to annex the Oregon Territory, Texas, and much of northern Mexico into the United States. The map is color-coded to show the extent of...

A map of northern and central Mexico and southern United states showing the area of conflict during the Mexican-American War (1846-1848). The map shows the Mexican boundary (under Spain) established by the Louisiana Purchase (1803)...

A map of the United States in 1845 after the Louisiana Purchase, the Lewis and Clark Expedition, and the annexation of Texas. The map is color-coded to show the States and territory of the United States west to the Pacific with the dates...

A map of the territory acquired from Mexico including the annexation of Texas in 1845, California, Utah Territory, and New Mexico Territory in 1848, and the Gadsden Purchase in 1853.

A map of the territory acquired from Mexico including the annexation of Texas in 1845 and California, Utah Territory, and New Mexico Territory in 1848.

A map from 1904 of the United States showing the territorial acquisitions up to the Gadsden Purchase in northern Mexico in 1853. The map is coded to show the territory of the original United States and the Northwest Territory defined by...

A map from 1904 of the United States showing the territorial acquisitions up to the Gadsden Purchase in northern Mexico in 1853. The map is coded to show the territory of the original United States and the Northwest Territory defined by...

A map from 1912 of the United States showing the territorial acquisitions up to the Gadsden Purchase in northern Mexico in 1853. The map is color-coded to show the territory of the original United States and the Northwest Territory...

A map of the United States showing the growth of the nation from 1776-1867. The map is color-coded to show the thirteen original states, the territory acquired by conquest during the revolution and the Treaty of 1783, the Louisiana...

A map showing the territory of the United States after the annexation of Texas in 1845, and the acquisition of the Oregon Country by treaty with Great Britain in 1846. The map is color-coded to show the possessions of the United States,...

A map of the United States showing the growth of the nation from 1783-1867. The map is color-coded to show the thirteen original states, the territory acquired by conquest during the revolution and the Treaty of 1783, the Louisiana...