The US just bombed 3 sites in Syria. Here's what we know about why states choose airstrikes.

The US just bombed 3 sites in Syria. Here's what we know about why states choose airstrikes.  Washington Post Syria air strikes: UK confident of successful mission, says PM  BBC News Russia Calls Syria Strikes 'Danger To World Peace' While US Allies Praise Attack  NPR Donald John Trump | TheHill  The Hill The Syrian War Is Actually Many Wars  The AtlanticFull coverage