Answer:
Letters on Advisability of a Bill of Rights, 1787-1789
One of the most significant challenges is building an airplane had to do with "propulsion", since the technology that allowed motors to have enough energy to lift an airplane into the sky with a passenger wasn't available for most of history.
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The Atlantic slave trade was the result of, among other things, labour shortage, itself in turn created by the desire of European colonists to exploit New World land and resources for capital profits.
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Answer:
They made tools from stone
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Telegraph is what people used to coomunicate to people in the 19th century
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