One of the master historians of twentieth-century Europe, Walter Laqueur is renowned for his "gold standard" studies of fascism, terrorism, and anti-Semitism. Here he describes how unplanned immigration policies and indifference coinciding with internal political and social crises have led to a continent-wide identity crisis. "Self-ghettoization" by immigrant groups has caused serious social and political divisions and intense resentment and xenophobia among native Europeans. Worse, widespread educational failure resulting in massive youth unemployment and religious or ideological disdain for the host country have bred extremist violence, as seen in the London and Madrid bombings and the Paris riots. Laqueur urges European policy makers to maintain strict controls with regard to the abuse of democratic freedoms by preachers of hate and to promote education, productive work, and integration among the new immigrants. Written with deep concern and cool analysis by a European-born historian with a gift for explaining complex subjects, this lucid, unflinching analysis will be a must-read for anyone interested in international politics and the so-called clash of civilizations. "