What factors contributed to the rise of political machines and their bosses? what were the positive as well as the negative aspects of boss rule in large cities?

There were many factors that led to the rise of political machines in American cities in the 18th, 19th, and 20th centuries. One of the major factors that led to the rise of political machines was the rise of immigrant populations who sought to gain and increase their influence in the political realm and served as a powerful political tool for political machines. Political machines worked to enfranchise these voters through a system of patronage, and bribes and would bring them out on election days to support politicians who paid political bosses or awarded government privileges to. Positive aspects of this system were that it gave some increased level of representation of immigrant populations and worked to enfranchise these new political groups. However, these machines led to a high level of corruption and hurt the meritocracy of government institutions at the time.