I think its shortage of good farmland. The US had a lot of good usable farmland
They needed more land build homes and start a fresh goverment
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The Military Revolution is the theory that a series of radical changes in military strategy and tactics during the 16th and 17th centuries resulted in major lasting changes in governments and society.
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Climate change and drought may have triggered both the initial dispersal of Indo-European speakers, and the migration of Indo-Europeans from the steppes in south central Asia and India.
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