Don't take my word for it.
That's the conclution of a classified National Intelligence Estimate. To wit:
The intelligence estimate, completed in April, is the first formal appraisal of global terrorism by United States intelligence agencies since the Iraq war began, and represents a consensus view of the 16 disparate spy services inside government. Titled “Trends in Global Terrorism: Implications for the United States,’’ it asserts that Islamic radicalism, rather than being in retreat, has metastasized and spread across the globe.
An opening section of the report, “Indicators of the Spread of the Global Jihadist Movement,” cites the Iraq war as a reason for the diffusion of jihad ideology.
The report “says that the Iraq war has made the overall terrorism problem worse,” said one American intelligence official.
Puts that whole "Central Front in the War on Terror" in a new light, doesn't it?