Manifest destiny

Manifest Destiny

The 19th-century doctrine that the expansion of the US throughout the American continents was both justified and inevitable.

Oregon Country

Acquired in 1846 through diplomacy with Great Britain.

Mexican Cession

Land ceded to the United States from Mexico in 1848 after the Mexican-American War.

Louisiana Purchase

Acquisition of land from France in 1803 under President Thomas Jefferson, which doubled the size of the U.S.

Treaty of Guadalupe Hidalgo

Treaty that ended the Mexican-American War in 1848, leading to significant land gains for the United States.

Texas Annexation

The incorporation of the Republic of Texas into the United States in 1845 through warfare.

Diplomacy

The management of relationships between countries, especially in terms of treaties and negotiations.

War

Conflict between nations or groups, used here to refer to the Mexican-American War.