David Bier of the Cato Institute writes that Muslim immigrants (4M, 60% of whom are first generation immigrants) assimilate more than is suggested by standard polling. Nearly one in four Americans raised Muslim are no longer Muslim. Their personal additudes often are closer to broader U.S. public opinion. On issues such as homosexuality, religious pluralism, interfaith marriage, scriptural literalism, and the role of religion in law, Muslims here are markedly more liberal than Muslims in most majority-Muslim countries. They become more liberal over time. American Muslims show strong rejection of terrorism and extremist movements, often at levels equal to or stronger than the general public. In sum, Muslim immigrants do assimilate. (Also go here).
Note: Among the 250,000 persons of Somali descent, about half live in Minnesota.