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In the mid-1800s, the growth of the populations of California and the western territories was mainly a result of the

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Factors that contributed to America's westward expansion in the later half of the 19th century included the quelling of Native American resistance and relocation of tribes to reservations, gold rushes (in Colorado, California, and the Black Hills of South Dakota) and the building of the Intercontinental Railroad. So silver and gold
User Brian Van Rooijen
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Answer:Discovery of gold and silver

Explanation:hope this helps and happy early hallowen :D

User Borderless
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