The European Union has signed the latest deal with an outside country to stop illegal immigration to the bloc in exchange for cash and investments. Mauritania joins Tunisia, Turkey, Libya and Morocco, a group of proxy nations tasked with stopping the massive flow of people north. Mauritania's help is crucial, as it lies along the busy human-smuggling route into Europe: from West Africa to Spain's Canary Islands. Human rights groups say "externalizing" borders has only led to more human tragedies. The World's Gerry Hadden reports from Barcelona, Spain.
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