- Private covenants were common in streetcar suburbs to preserve their middle- and upper- class character.
- Houses in streetcar suburbs had quality amenities such as yard space, bathrooms, and heat.
- Population growth in the late 19th century was thanks to increased natural growth due to improved healthcare (such as germ theory and lower infant mortality rates).
- Chinatowns were run-down and filled with illegal cafes, gambling dens, and poverty.
- Lot coverage is the proportion of a building lot covered by structures. Tenements often had very high levels of lot coverage.
- Jacob Riis was a Danish immigrant to the United States who worked as a police reporter, photographed and wrote about the slums, and published How the Other Half Lives in 1890.
