Globally it roughly quadrupled (depending on one's definition of urban); in Britain it grew nearly eightfold, in the US more than ninetyfold. China's in contrast rose by probably less than half, reflecting differences in rates of economic development and total population growth.
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Slums grew rapidly.
The middle class moved away.
A government-controlled economy
Commuting to work became more common.
The 20th century, from 1934 to 1945.
World War II took place in the 20th century (1900s)
The ideals of vocal beauty certainly expanded over the course of the 20th century. It was then that depth was truly valued.
World war one: 1914-1918 World war two: 1939-1945
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