Iraq and Syria Since December 2013, ongoing clashes have occurred throughout western Iraq between tribal militias, Iraqi security forces, and ISIL. In early January 2014, ISIL militants successfully captured the cities of Fallujah and Hīt,[306] bringing much of Anbar Province under their control. In June 2014 ISIL took over the Iraqi city of Mosul. By December 2015, the Islamic State covered a vast landlocked territory in western Iraq and eastern Syria, with a population estimate of 2.8 to 8 million people.[57][307] In Iraq and Syria, ISIL uses many of those countries' existing governorate boundaries to subdivide its claimed territory; it calls these divisions wilayah or provinces.[308] By June 2015, it had established official "provinces" in Libya, Egypt (Sinai Peninsula), Saudi Arabia, Yemen, Algeria, Afghanistan, Pakistan, Nigeria and the North Caucasus.[309] Since then, ISIL has continued to receive pledges of allegiance and publish media releases from groups in countries like Somalia,[310] Bangladesh[311] and the Philippines,[312] but it has not announced any further official branches, instead identifying new affiliates as simply "soldiers of the caliphate".[313]

https://en.wikipedia.org/wiki/Islamic_State_of_Iraq_and_the_Levant#Territorial_control_and_claims

https://assets.weforum.org/editor/2ZtkUoqkEVEogFVmVDJRGg0vqlpcFlNZCdcEC1eTRsM.jpg

The fact that it happened proves it. They let it happen.