Why was the louisiana purchase disastrous for the native americans? a. it took away their western territories. b .they lost their ability to trade with the french. c. it led to undesired removal. d. the land was barren and unfruitful.

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copernicus finished the first manuscript of his book, "de revolutionibus orbium coelestium" ("on the revolutions of the heavenly spheres") in 1532. in it, copernicus established that the planets orbited the sun rather than the earth. he laid out his model of the solar system and the path of the planets.