I'm not saying it couldn't happen in the United States, but why do you think Europeans tolerate all these Muslim Extremists?
Arab people immigrate in the 70's.
they were muslim but not very practising.
1-during the 80 and 90's a lot of salafist preacher were expulsed from various country in middle orient, lot of them immigrate in France and G.B and start to preach for jihad.
2-arab have an unbelievable ability to fall in extremism, islam is not a problem, islam and arab is the problem.
3-politics are buying social peace, and the next election, so they give land for mosque, and money for mosque.
4-i'm a cop in a town near Paris, some place are muslim enclave, muslim libray, muslim clothe shop etc etc etc.
5-media are lying to us, they spread the fact of colonialism, slavery etc etc to culpabilise us, they're trying to convince us that arab are falling in extremism because of the white racism. Arab just fall in extremism because they are extremist.