Manila, like most of the world's large cities, suffers from a huge and problematic urban sprawl.

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Like their predecessors in earlier periods, most immigrants are concentrated in a few large cities, such as Los Angeles, Miami, and New York City, and 45 percent of immigrant students who have been in the United States for three years or less are enrolled in California schools.

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The no annual fee Citi Hilton HHonors Visa Signature Card from Citibank offers a sign-up bonus large enough for a few free nights in most cities.

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It came about not because New York got green religion, but because the population, unlike that in most of America's other large, old, north-eastern cities, is growing.

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Most of the places that made this list also happen to be large cities where the real estate is desirable to the general population, and not just to academics and students.

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"Most of the work we do would otherwise go to large, for-profit outsourcing firms in big cities in India and China, " she says.

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