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noun. a tract of 45,535 sq. mi. (117,935 sq. km), now contained in New Mexico and Arizona, purchased for $10,000,000 from Mexico in 1853, the treaty being negotiated by James Gadsden. Examples from the Web for Gadsden Purchase. The Gadsden Purchaseof 1853 secured a further small strip of territory from Mexico.

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john Augustus Sutter Sr. (February 20, 1803 – June 18, 1880), born Johann August Suter, was a German-born Swiss pioneer of California known for establishing Sutter's Fort in the area that would eventually become Sacramento, California, the state's capital.

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The Donner party , or Donner -Reed party, was a group of American pioneers led by George Donner and James F. Reed who set out for California in a wagon train in May 1846

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A prospector in the California gold rush of 1849.

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a surficial mineral deposit formed by the concentration of small particles of heavy minerals, as gold, rutile, or platinum, in gravel or small sands