Immigration is right at the top of the political agenda for the 21st century. This book draws together and unifies analysis of immigration into the major EU countries and the US, presenting in an accessible and clear way the major trends and dramatic developments of the past decade. While the influence of the welfare state on immigration incentives is a key issue, various other influences on both legal and illegal migration are analysed, together with the implications of migration for the market outcomes on these two continents.