Final answer:
The increase in city populations led to the development of the education reform movement, the entertainment industry, and projects to make the city more beautiful.
Step-by-step explanation:
As a result of the increase in city populations, all of the above developed: the education reform movement, the entertainment industry, and projects to make the city more beautiful.
The growing population in cities led to the need for better education systems, which resulted in the education reform movement. Increased population also created a demand for entertainment options, leading to the growth of the entertainment industry. Additionally, the challenges of overcrowding and urbanization prompted projects to make the city more beautiful, such as the City Beautiful movement, which focused on improving the aesthetics and quality of urban spaces.