Peoples on the Move: The Immigration Crisis

Immigration has been a hot button topic in the United States for many years. More recently, other western nations have grappled with their own migrant crises. The issue has divided conservatives and liberals and has possibly fueled nationalist sentiment in the US and countries in western Europe. While most would agree that there certainly is an immigration crisis, they can't agree on solutions. What exactly defines an immigration crisis and what humanitarian problems do these crises create? What is the responsibility of the international community to solve them? How can countries help migrants without compromising their own integrity?