Tom Friedman notes: It is easy to see how ISIS spread.

From The New York Times:

It is easy to see how ISIS spread. Think about the life of a 50-year-old Iraqi Sunni male from Mosul. He first got drafted to fight in the eight-year Iran-Iraq war that ended in 1988. Then he had to fight in the Persian Gulf war I after Saddam Hussein invaded Kuwait. Then he lived under a decade of U.N. sanctions that broke Iraq’s middle class. Then he had to endure the years of chaos that followed the U.S. invasion, which ended with a corrupt, brutal, pro-Iranian Shiite regime in Baghdad led by Nuri Kamal al-Maliki that did all it could to keep Sunnis poor and powerless. This was the fractured political ecosystem in which ISIS found fertile ground.