On the highways and byways of every continent, hundreds of millions of immigrants are constantly on the move. Because of growing inequalities of wealth caused by unregulated economic globalization, political and ethnic conflicts, environmental degradation, instant communication, and viable means of transportation, more and more people are migrating than ever before. Crossing international borders, whether compelled or voluntarily, is a major characteristic of our present epoch. No countries or regions are immune from this reality. Facing the growing scope, complexity and impact of the current...