Respect and obey federal, state, and local laws. Respect the rights, beliefs, and opinions of others. Pay income and other taxes honestly, and on time, to federal, state, and local authorities. Defend the country if the need should arise.
The biggest issue is by technology.
Stronger rails allowed heavier goods to be shipped from one point to another. Larger trains allowed more load to be moved thus allowing an increase in what "people could be moved" If you have any other questions feel free to ask!
The difficulties they struggled with was the Bubonic plague also known as the Black Death caused by bacterium yersinia pestis and civil war.
