Final answer:
The issues of requiring more police officers, water pollution, and overcrowding in cities were a result of Urbanization, which led to poor living conditions and increased disease spread, prompting legislative and infrastructural responses to improve public health.
Step-by-step explanation:
The need for more police officers, water pollution, and overcrowding in European and American cities can be directly attributed to Urbanization. The rapid growth of cities brought with it numerous challenges such as poor sanitation, which led to open sewers and the spread of diseases like cholera and tuberculosis. Living conditions in urban areas were often deplorable, characterized by crowded housing and inadequate infrastructure. Governments and reformers tried to combat these issues by implementing various public health acts and improvements to municipal planning, such as the development of modern sewer systems and the enactment of legislation to limit pollution and promote public health.