Answer:
Why did cities emerge?
Most american cities that emerged in the far west, such as calorado springs the former made by railway industrialist William Jackson Palmer
were on routes of major railways, such as the trans pacific railway line, which led to the formulation of towns situated on the route primarily along railway line stops, or on the route itself settlements formed. Americas formulation of cities was based ALONG the construction of railway lines, which is why you see a huge cluster of industrial cities and plants in the east compared to the west, where most railways are.
Why do cities attract people?
Factors: Railways, railways because they spurr travel, and thus movement to said cities on mass.
Cities attract people for work, similar to the serf emancipation during the great reforms of alexander the II, most serfs moved to the cities looking for work, and thus filled the cities up formulating slums similar to those in Saint Petersburg by the end of the 18th century. Alongside the mere fact that cities themselves, are centers of urban populace because THEY ARE safe, most cities have actual police precincts that patrol the city, proper running sewage and plumbing systems, and most importantly healthcare and the sort.
Surburbs develop because the city becomes too dense, and housing becomes more expensive compared to surburban ones.
Step-by-step explanation: