Migration has been a defining feature of the Mexico-US relationship for most of the 20 th century, but legal immigration remained low until recently. About 36 percent of 20 th century Mexican immigrants arrived in the 1990s, and 34 percent of the apprehensions of unauthorized Mexicans were in the 1990s (table 1). Over the past century, Mexican migrants were negatively selected: those who left Mexico usually had less education and fewer skills than the average Mexican, and most of the Mexicans who arrived had their first US jobs in seasonal agriculture (Martin 1993). Bilateral

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