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It's a land of 29,640 square miles, or 76,800 kilometers squared, and it provided a more easily constructed route for future southern transcontinental railroad line, the 2nd of the routes, for future Southern Pacific Railroad, which was later constructed in 1881/1883

At the conclusion of the Mexican–American War in 1848, the U.S. annexed New Mexico as part of the larger New Mexico Territory. It played a central role in American westward expansion and was admitted to the Union as the 47th state on January 6, 1912.Answer:

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