People around the world move from their homes for different reasons. Some seek opportunity. Others are fleeing dangerous conditions or have been displaced by environmental disasters. How welcoming should countries be toward immigrants and refugees, and what value do such migrants add to their new surroundings? The diverse viewpoints in this resource explore the benefits and shortcomings of strict immigration policies and open borders, how immigrants can sustain countries and how they can create larger problems, and what the international community is or is not obligated to do to help.