via.q13fox.com
Timeline of the Syrian civil war and US response
WASHINGTON -- The U.S. attack on a Syrian air base came after years of heated debate and deliberation in Washington over intervention in the bloody civil war. Chemical weapons have killed hundreds of people since the start of the conflict, with the U.N. blaming three attacks on the Syrian government and a fourth on the Islamic State group. One of the worst yet came Tuesday in rebel-held northern Idlib and killed dozens, including women and children.