Usa has not taken those cause they aren't close to Africa. US got the mexican illegal migrants, which is way better illegal immigration since their culture is still similar in core values and style. The liberals did use some survey of USA muslims being more pro gay marriage than evangelicals to prove muslims were more tolerant, but the muslims coming there are a very small percentage of more secular selected people. Europe has far higher percentages of muslims because of geographical location and they're way more bigoted cause they represent average people of their culture and not the more upper liberal class.