Both Iraq and Syria are now preparing to rebuild their damaged cities, in particular Aleppo, Homs and Mosul. The military defeat of ISIS came faster than expected, I assume he mercenaries ran out of money. Raqqa is the last stronghold.
https://www.youtube.com/watch?v=e1Ux5-YSSys
https://www.youtube.com/watch?v=Wy7idtmZQtU
This started when Obama/Clinton decided in 2012 that regime change in Syria was necessary by arming 'rebels'.
http://www.bbc.com/news/av/world-middle-east-17578802/clinton-the-world-will-not-waver-assad-must-go
http://www.cbsnews.com/news/obama-signs-bill-to-arm-and-train-syrian-rebels/