Lecture 10- transitions: metropolitan form: 1920-1945 suburban infilling. U. s. 1900: 470,000 cars 1930: 27 million. 1916 us federal aid roads act (a provision of funding to states in the us as long as they plan construction to create roads) Zoning allowed for exclusion of land use and groups. Growth into automobile ownership (cars are faster, come in different varieties) transporation infrastructure. Canada: 1 million cars 1945; 4. 3 million 1961 (harris 2004) Suburban growth eclipsed urban growth (% and #) Us central cities gained 6 million people (11. 6%); suburbs gained. Land-use zoning (your house had to be a certain size if you lived in the suburbs, therefor your neighbors will be people who can afford what you can afford homogeneity is created) In the post war period there was a lot of migration of african. Americans from the south, to the cities in the west/north. White families left the cities so they could live in white neighborhoods.