Why did Turkey invade? Why did America leave? How did the Kurds gain so much land? The New York Times answers 10 key questions about the Turkish invasion of northern Syria.

The Turkish invasion of Kurdish-held territory in northern Syria has complicated an already chaotic war.

What began eight years ago as a series of nonviolent protests against the Syrian government morphed into an international conflict, between dozens of local factions, the Islamic State group and several foreign countries.

Now, a US ally is attacking a group that fought side by side with US troops for years — and much

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How many Kurds are there in Syria?

How did Syrian Kurds become involved in the war?

How did America become involved in the war?

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How did this Kurdish militia become a US ally?

Why do Syrian Kurds control so much land?

Why does Turkey want to oust them from the area?

How did the United States try to solve this problem?

Why did US policy suddenly shift?

Have US troops completely left the area?

Who benefits from Trump's decision?