ISIS has been around since 2006 mate, check your sources. Also they weren't a big threat until they decided to journey into Syria and get some new allies in the Syrian rebels, which were armed and trained by the US. Also the vehicles and weapons ISIS use in Syria are literally American weapons and vehicles left behind since the war in Iraq. This is of course not only Americas fault, but much of ISIS growth to what it is today is on the necks of Russia, America and Turkey together.