Syria's war: Who is fighting and why

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After four-plus years of fighting, Syria's war has killed at least hundreds of thousands of people and displaced millions. And, though it started as a civil war, it's become much more than that. It's a proxy war that has divided much of the Middle East, and has drawn in both Russia and the United States. To understand how Syria got to this place, it helps to start at the beginning and watch it unfold:

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