I think what happened was that the population would build up because it was a big city and there was wars going on in the east part of Europe.
Forced relocation to northern cities.
Large American cities in the early twentieth century had distinguishable characteristics from other towns throughout the country. These cities often lacked farms which were replaced with industrial facilities. Store fronts lined the roadways, saloons could often be found only in these cities, and crime was high in these areas.
The population of cities and suburbs increased after WW2.
The population of cities and suburbs increased after WW2.
Poverty, war, and famine caused the cities to grow in population at the end of the nineteenth century.
forced relocation to northern cities
migration to Canada, the United States, Australia, and New Zealand an increase in the use of coal the growth of cities
Rural states lost population, while states with large cities gained population.
That could describe so many cities and politicians all over the world over many centuries. You may be referring to 'muckrakers', a form of journalism that emerged in the US at the beginning of the twentieth century.
Population in slums increased
1. The rise of industry and commerce.2. The development of an intellectual class.3. Foreign imperialism.
It grew long before the 20th century. Agriculture gave man the means to establish towns that turned into cities because they didn't need to follow herds of animals to eat. With cities/towns came government, art, religion, and other needs of civilization.