Final answer:
The Gadsden Purchase includes part of Arizona and was acquired through a treaty signed in 1853.
Step-by-step explanation:
The Gadsden Purchase, a land acquisition treaty signed between the United States and Mexico in 1853, includes part of Arizona. It was negotiated by James Gadsden, the American ambassador to Mexico at that time. The purpose of this purchase was to secure land for the construction of a southern transcontinental railroad.
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