of the 8 territories that were bought under the flag of the United States by 1853 which one was the most important addition to the growth of the United States

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To determine which of the 8 territories acquired by the United States before 1853 was the most significant in terms of the country's growth, we can evaluate their historical impact. These territories are:

1. Louisiana Purchase (1803): This purchase doubled the area of the United States overnight, providing vast expanses of fertile land west of the Mississippi River.

2. Florida (1819): The acquisition of Florida consolidated control over the southeastern region of the country, securing trade routes and removing Spanish interference.

3. Texas Annexation (1845): Texas, previously an independent republic, joined the United States as a state, further expanding territorial reach.

4. Oregon Country (1846): The acquisition of the present-day Oregon, Washington, and parts of British Columbia cemented American control over the Pacific Northwest.

5. Mexican Cession (1848): This territory, obtained after the Mexican-American War, included the present-day states of California, Nevada, Utah, and parts of Arizona, New Mexico, Colorado, and Wyoming. It played a vital role in the country's westward expansion.

6. Gadsden Purchase (1853): The United States purchased a strip of land (now Arizona and New Mexico) from Mexico to facilitate the construction of a transcontinental railroad.

Out of these territories, the most important addition to the growth of the United States was the Louisiana Purchase. The acquisition more than doubled the nation's size and opened up vast amounts of fertile land for settlement and development. It also secured control over the Mississippi River and its trade routes, facilitating westward expansion and economic growth. The Louisiana Purchase laid the foundation for America's manifest destiny and established the United States as a continental power.