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Emigration to North America slowed between 1760 and 1815.
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he 1790 census indicated that 20 percent of the American population was of African origin. There was little African immigration after that date, and the percentage of the population that was black declined.
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By 1913, well over four-fifths of all immigrants were from these areas of Europe, especially Italy, Austria-Hungary, and Russia.
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Between about 1815 and the start of World War I in 1914, immigration tended to increase with each passing decade.
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The United States passed its first major legislation to restrict immigration in the 1920s.
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Depression of the 1930s and World War II in the 1940s, cut immigration to a fraction of its annual high in 1913.
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Between 1960 and 1987, for example, the farm population fell from more than 15 million to under 6 million.
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In 1990, the United States had a population approaching 250 million, with a density of roughly 235 people per square kilometer.