As the U.S. considers a military strike in Syria, take a look at some of the key things to know about the conflict and the country.
Number of extremists depends on who you ask. Syrian opposition leaders have regularly argued that extremists are a minority within their ranks. Kerry said this week that 15-25 percent of the rebels are extremists, but some U.S. lawmakers, including Rep. Michael McCaul of Texas, have been skeptical of that number. How strong the extremists are also depends on what part of the country you look at. Islamist militia are widely believed to have dominant control in rebel-held areas in northern and eastern Syria.
Library of Congress
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