Matters of Scale - Human Migration

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Number of illegal immigrants crossing from Mexico into the United States who were caught by the U.S. Border Patrol in two Arizona towns in the first five days of May 1998
5195
Number of immigrants from Mexico who pass legally into the United States in an average five-day span
2323
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Growth in the U.S. population each year due to immigration
1 million
Growth in the U.S. population each year due to unplanned pregnancies
1.3 million
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Number of people who died trying to cross illegally into the United States over a 4-year period from 1993 to 1996
1185
Approximate number of people who died trying to cross the Berlin Wall over a 28-year period from 1961 to 1989
100
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Percentage of countries whose policies were aimed at reducing immigration, in 1976
6
Percentage aimed at reducing immigration in 1995
33
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Total number of migrants, worldwide, today
100 million
Total population of the world at the time of the classical Greek civilization
100 million
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Sources: Berlin Wall deaths: Jerry Borstein, The Wall Came Tumbling Down (New York: Arch Cape Press, 1990); 70-year-olds: Susan B. Carter and Richard Sutch in The Immigration Debate (Washington, DC: National Academy Press, 1998); Policies: International Migration Policies (New York: United Nations, 1998); Number of migrants worldwide: Thomas Sowell, Migrations and Cultures (New York: Basic Books, 1996).