How did the westward expansion and the Industrial Revolution affect American society?
Westward expansion profoundly changed American society. As the nation grew, more people looked west in order to obtain cheaper land. Once there, they developed communities with stores and professional positions, such as blacksmiths and lawyers. Between 1820 and 1860, many of these Western towns were some of the fastest growing places in the United States. These people in the West also aspired to own manufactured goods, and the United States was beginning to get into the Industrial Revolution after the Revolutionary War.
Before the war and immediately thereafter, American manufacturing was considered secondary to British work. After the war, Americans looked to develop their own manufacturing as a way to grow industries at home and also as a source of national pride. More people would work in American factories in the period leading up to the Civil War and after the war this number would increase significantly with more European immigration.
Most of the factory jobs were in the North, but in order to facilitate transportation of raw materials and finished products, the US government undertook a program of internal improvements called the American System which improved railroads and canals in most of the United States. This benefited the West as it made transportation of goods and people easier; it also benefited Americans as a whole, as American manufacturing increased and new jobs were being created.
When the United States became its own country in the late 1700's, most of the population was engaged in agriculture and lived on the East Coast. There was a minimal industrial base, as Great Britain had actually attempted to restrict the Colonies trade and industrial pursuits, preferring to keep them as a source of raw materials and to keep them from competing with the Mother Country. However, after the American Revolution, no such restrictions existed, and trade and industry flourished. Simultaneously, immigration increased, and new farmers necessarily had to move westward to farm. With the full development of a railway transport system, agriculture and industry intersected -- the railroad moved agricultural products Eastward to the cities, and moved manufactured goods Westward to the farms. This internal trade removed the necessity for most of the population to be engaged in agriculture, resulting in most working in factories in cities by the late 1800's, which had also migrated westward after the settlers and farmers.
Westward expansion was especially important in the Reconstruction Era that followed the Civil War. Additionally, it contributed to the conflagration of the many issues that ignited the Civil War; as the United States gained more territory, the question of whether the new states would be freesoil or slave-holding states was hotly debated.
After the Civil War, the West offered inspiration to citizens hopeful of taking part in and expanding the ideals of a free labor society. As the Republican party and special interests groups desired a more active government, those who were opposed saw the West as a place untouched by government authority. It was America in it's most raw, idealic form.