Extending a hundred miles across south-central Ontario, Toronto is the fifth largest metropolitan area in North America, with the highest population density and the busiest expressway. At its core old Toronto consists of walkable neighborhoods and a financial district deeply connected to the global economy. Newer parts of the region have downtown centers linked by networks of arterial roads and expressways, employment districts with most of the region's jobs, and ethnically diverse suburbs where English is a minority language. About half the population is foreign-born the highest...