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America's Own Extremists
Why the next big challenge to US security could come from within the country.
Jonny Dymond looks at America's new internal threats, from Islamic extremists and right-wing militias.
America devotes vast resources to countering external threats, and the past decade's wars in Afghanistan and Iraq have focused attention abroad.
However, there are signs that the next big challenge to US security could come from within the country.
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