How did the climate affect the rise and decline of various native peoples between about 10,000 b. c.e. and a. d. 1500?

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in 1803 the louisiana purchase took place, doubling the size of the country. by 1840 almost 7 million americans had migrated westward in hopes of securing land and being prosperous. the belief that settlers were destined to expand to the west is often referred to as manifest destiny.

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