I disagree with the review from JSB below that this book is dated. He (or she) cites as an example of this by stating that the Irish and Italians are no longer significant immigrant groups. Perhaps these two groups do not compare, with respect to recent entry, with other ethnic groups, but they are highly significant. Take for example New York City's borough of Staten Island, which claims 44.5% of it's population as having Italian ancestry. Ancestry is a very significant indicator, and still has a very real influence on group morals, actions, politics, voting patterns, etc. As a student of urban planning and demography, this book was one of my most memorable!