North America metropolitan area by population in North America: Greater Mexico City. Canada also breaks into the top ten largest metropolitan areas with the Toronto metropolitan area having six million people. The proximity of cities to each other on the Canada–United States border and Mexico–United States border has led to the rise of international metropolitan areas. These urban agglomerations are observed at their largest and most productive in Detroit–Windsor and San Diego–Tijuana and experience large commercial, economic, and cultural activity. The metropolitan areas are responsible for millions of dollars of trade dependent on international freight. In Detroit-Windsor the Border Transportation Partnership study
History of the Jews in Pittsburgh North America." Squirrel Hill contains three Jewish day schools, catering to the Lubavich, Orthodox, and Conservative movements. There are over twenty synagogues. The Jewish community also offers four restaurants, a Jewish Community Center and an annual festival. It is estimated that one-fifth of the population of Squirrel Hill is Jewish. History of the Jews in Pittsburgh Jewish history of Pittsburgh, the second largest city in the state of Pennsylvania, United States, and the chief city of Western Pennsylvania. According to the 2002 Pittsburgh Jewish Community Study, "Jewish households represent 3.8% of the total number of households living in Allegheny County."