Europe of population are Saint Petersburg, Madrid, Berlin and Rome, each having over 3 million residents. When considering the commuter belts or metropolitan areas, within the EU (for which comparable data is available) London covers the largest population, followed in order by Paris, Madrid, Barcelona, Berlin, the Ruhr area, Rome, Milan, Athens and Warsaw. "Europe" as a cultural concept is substantially derived from the shared heritage of the Roman Empire and its culture. The boundaries of Europe were historically understood as those of Christendom (or more specifically Latin Christendom), as established or defended throughout the medieval and early modern history of
The Polish Peasant in Europe and America The Polish Peasant in Europe and America The Polish Peasant in Europe and America is a book by Florian Znaniecki and William I. Thomas, considered to be one of the classics of sociology. The book is a study of Polish immigrants and their families, based on personal documents, and was published in five volumes in the years 1918 to 1920. At the turn of the 20th century, Poles accounted for about a quarter of all new immigrants to the United States. Chicago was host to about 350,000 Poles and had the third largest population of Poles (after Warsaw and Łódź).