A cook in the army was known to spread the disease.
The Spanish influenza was caused by an H1N1 virus that emerged during World War I. The close quarters of soldiers in military camps and the movement of troops around the world facilitated the rapid spread of the virus. The lack of immunity in the population and the crowded conditions in cities contributed to the severity of the pandemic.
Canals were the mean of transportation that contributed to the growth of river cities such as Cincinnati.
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thriving cities
PCB's
D the access to major waterways
Great rivers
You need to specify which two cities you are referring to if you want to make it possible to answer your question.
Henry Bessemer
Its commercial links with coastal cities
No cities were targeted at Pearl Harbor; only the military bases.
They both contributed to the invention of the skyscraper, which really transformed cities.