In order to have an excuse to present to the public the United States along with several other countries helped create the "ISIS" . It's all about the oil and corporations now days...
They did not intentionally create ISIS The war in Syria left a huge vacuum in larger parts of the nation. Some were filled by rebels, other by Nusra, some by Kurds and then you have ISIS. The worst of the worst West Asia has to offer Some however has helped them grow - Turkey