America's strength comes from its multiculturalism, but that's only true when all its people, all its races and religions, believe in the same values. Liberals fetishize separation, arguing that immigrants don't need to learn English, don't need to stop subjugating women with hijabs and arranged marriages, don't need to become citizens. They encourage otherness rather than integration. They want immigrants to change the country, rather than the other way around. They say Islam is not the enemy - but that's only true if Islam is a religion and not a political ideology bent on undermining democracy. Brussels is the result of this thinking. It's what happens when immigrants are allowed to construct their own state within a state, not pushed to become part of a nation.