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Europeans moved westward only as far as the eastern flanks of the Appalachian Mountains.
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20 percent of the American population was of African origin
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less than 10 percent of the population could even loosely be defined as urban
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Period: to
immigrants continued to come from northwestern Europe
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the U.S. Bureau of the Census was able to announce that the American settlement frontier was gone entirely.
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four-fifths of all immigrants were from these areas of Europe, especially Italy, Austria-Hungary, and Russia.
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Period: to
the farm population fell from more than 15 million to under 6 million.
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Period: to
U.S. population statistics suggest that a fourth major mobility period is at hand.
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Mexico, the Philippines, and the West Indies provided the greatest number of migrants to the United States
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the United States had a population approaching 250 million, with a density of roughly 235 people per square kilometer.
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settlement expanded westward in a generally orderly fashion.
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Settlement congregated in areas that offered an identifiable economic potential.
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The number of Americans employed in manufacturing has increased only slightly during the past two decades, whereas tertiary and quaternary employment has boomed.