(BAGHOUZ, Syria) — U.S.-backed forces declared military victory over the Islamic State group in Syria on Saturday after liberating the last pocket of territory held by the militants, marking the end of a brutal self-styled caliphate the group carved out in large parts of Iraq and Syria in 2014. After weeks of heavy fighting, the tent camp where the militants had made their final stand in the village of Baghouz was bombed to shreds.