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