For centuries, immigration has been taking place throughout the world, from different parts of the world, by different groups of people, to different countries. Until recently, immigration was considered a cultural, intellectual, and population gain for the host countries. Assimilation of foreign immigrants into Judeo-Christian populations had never been an issue until Muslim immigrants began arriving in great numbers. ?Assimilation, multiculturalism, tolerance, the belief that the refugees would go back when conditions in their countries improved?those were the norm until 9/11 shook Western countries to the core. Contrary to Western beliefs, Muslims make no secret of their intention to spread Islam wherever and whenever they can, and they have no intention of assimilating into any Western culture. In fact, Islam discourages?actually forbids?assimilation. Norway, Sweden, France, the United Kingdom, Germany, Belgium, the Netherlands, Switzerland, Spain, Italy, Greece and the United States have had to deal with the rise of extremist Islamists, often funded and indoctrinated by the governments and the clergy