Dentify one result of urbanization in the early 1900s.

Urbanisation affects the physical environment through the impacts of the number of people, their activities and the increased demands on resources. Urbanisation has negative consequences on health due mainly to pollution and overcrowded living conditions. It can also put added pressure on food supply systems.

A reform movement is a type of social movement that aims to bring a social or political system closer to the community's ideal. A reform movement is distinguished from more radical social movements such as revolutionary movements which reject those old ideals in the first place.

Reformists' ideas are often grounded in liberalism, although they may be rooted in socialist (specifically, social democratic) or religious concepts. Some rely on personal transformation; others rely on small collectives, such as Mahatma Gandhi's spinning wheel and the self-sustaining village economy, as a mode of social change. Reactionary movements, which can arise against any of these, attempt to put things back the way they were before any successes the new reform movement(s) enjoyed, or to prevent any such successes.

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