Steel changed people’s lives by making possible the
a. invention of radio. c.development of electricity.
b. construction of skyscrapers. d.establishment of time zones.

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question - in the 1900s there were two competing views about the environment that often pitted industrialist and conservationist against one another. how were these two competing views demonstrated by the environmental policies of president roosevelt and president taft?

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disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.