Answer:
The expansion of railways meant manufacturers could ship goods cheaply.
The building of the railroads changed the environment of the West.
Explanation:
The ratio of air's water-vapor content to its capacity to hold water vapor at that same temperature = relative humidity! Hope I helped! :)
The smallpox epidemic in 1721 spread between 5,889 Bostonians and 844 died of it. October was the worst month, with 411 deaths
