The correct answer is C; Cities developed professional firefighting and police forces.
Further Explanation:
The city dwellers lived in bad conditions during the late 1800's. The streets were not paved, there were feces in the streets from the horses, gangs had started and riots were commonplace. The crime and fires started by arsonists were getting worse each day, because more people were living in the city.
To stop the crimes and fires, the city developed new ways to improve the life of the city-dwellers. The started their first police force and also a firefighter force. They also paved the streets, and put in sewers throughout the city. During this time they also made the suburbs and started regulating the housing in the city.
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The unfree labors were able to improve the economy of the American society. These unfree laborers were the one manning farms and help in mass production. During this time when the US was concentrating on the agricultural sector, many landowners hired unfree labors. Many landowners would hire them because they have cheap labor and they can work longer than expected working hours.
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Seems like an open ended question but I'm going to go with tax breaks for those industries