The important issues was Democracy.
The compromise counted three out of every five slaves as people, giving the Southern states a third more seats in Congress and a third more electoral votes. The Southerners were using their slaves to their advantage politically.
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Well it’s a book. do you need a summary?
Better transportation affected the growth and urbanization of cities by allowing more people to travel, which in turn led to more people settling down in these cities to start a new life.
Better communication affected the growth and urbanization of cities by allowing people to understand each other better, which led to more people coming to these cities and socializing, which improved economy. People who can communicate can perform business better and communicate outside of the city, drawing more people there.