As fresh today as when it was first published a half-century ago, Boston’s Immigrants illuminates the history of a particular city and an important phase of the American experience. Focusing on the life of people from the perspective of the social historian, the book explores a wide range of subjects: peasant society and the cause of European migration, population growth and industrial development, the ideology of progress and Catholic thought, and urban politics and the dynamic of prejudice. A generation of students and scholars has profited from its insights, and general readers have enjoyed its lively style. A new Preface by the author reflects upon the book’s intellectual origins.