This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.
"People don't pick up and leave their homes just for the heck of it," Janet Napolitano, head of homeland security during the Obama administration, told the BBC. "They're usually in desperate straits - poverty, joblessness, high crime, violence, lack of civil institutions in their countries of origin."