Originally published in 1991, this book covers an usually long time – from the 17th to the 20th Century – and considers the impact of internal migration and

What do governments do when much of their population simply gets up and walks away? In Mexico and other migrant-sending countries, mass emigration prompts gover

Since 1965 the foreign-born population of the United States has swelled from 9.6 million or 5 percent of the population to 45 million or 14 percent in 2015. Tod