Immigration could lead to extremism, civil unrest and divisions over ethnicity and race

Swelling populations and a global tide of immigration will present new security challenges for the United States by straining resources and stoking extremism and civil unrest in distant corners of the globe, CIA Director Michael V. Hayden said in a speech. The population surge could undermine the stability of some of the world's most fragile states, especially in Africa, while in the West, governments will be forced to grapple with ever larger immigrant communities and deepening divisions over ethnicity and race.