Because of the fast pace that people were moving to cities, housing, sewage and social systems, and transportation were unable to keep up.
Explanation: disease were prevalent problems in all urban centers; city planners and inhabitants alike sought new solutions to the problems caused by rapid urban growth. Living conditions for most working-class urban dwellers were atrocious.
Congestion, traffic, violence, and disease were all common concerns in all metropolitan areas, and city planners and residents alike sought new solutions to the issues brought about by rapid urbanization. The majority of working-class city dwellers lived in deplorable circumstances. Housing, sanitation, and social systems, and transportation systems were unable to keep up with the rapid speed at which people were moving to towns. Examine how city dwellers dealt with the issues that arose as a result of rapid urbanization. City dwellers had to contend with the city's pollution, filth, and crime, as well as the misery of factory work and the overcrowding and unhealthy conditions of tenements. One of the most pressing problems was sanitation, as cities' impoverished streets were often overcrowded and overrun with animals and waste. There was a lot of disease and garbage all over the place.
I researched this question and after the Romans were attacked by the Goths (a Germanic people) it went on to explain how the Slavs settled in Ukraine. I apologize if this isn't correct
