A large number of Iraqis and Afghans immigrated her in the last decade as a direct result of the American occupations of those countries. For some, they were fleeing persecution because they had cooperated with the American Army or served as translators. Others were trying to escape the sectarian violence there. It is also easier to immigrate to the US if you have money, and a significant number of Iraq's wealthier families fled the country when things got bad from 2005 - 2007.
Most of the rest of the effects of US policies, in my opinion, have been on those 6.5 million Muslims who already resided in America on 9/11.