Answer
First, the United States gained territory through purchases. In addition to the Louisiana Purchase, America arranged payment for the Gadsden Purchase in what is now Arizona and New Mexico. Next, the United States gained territory through treaty agreements with its neighbors. For instance, the United States obtained the Oregon Territory through an agreement with England over the ownership of lands in the Northwest. Often, these treaty agreements centered on lines of longitude or latitude. Finally, the United States gained land because of war. After the Mexican-American War, Mexico agreed to give the Mexican Cession to the United States in exchange for a small payment. Mexico also recognized America’s right to annex lands in Texas officially.
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