The Sunni Jihadist ‘Islamic State’ or Dawla Islamiya is the manifestation of what Sunni Islamists have been striving for for a long time, especially groups like Hizb-ut-tahrir and many other hardline Islamist groups.
After 9/11 as I started to research into Islamic teachings I started visiting a liberal ex-Muslim website called secular Islam. There in a comments section for several months I viewed comments / arguments flying back and forwards and in particular some Islamist kept posting links to khilafah.com articles. These were truly scary reading material, very professionally produced with a lot of erudite writers and a large following. More than anything else these articles woke me up to the threat that Islamic thought poses with the most expansionist and supremacist teachings being not a mere historical curiosity but underpinning a large movement of Muslims striving hard for them.