Big crowd congestion, High pollution rates, High Crime tolls, and Highly fastly spread diseases all caused problems for the urban areas at this time.
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The growth in immigrants coming to the USA.
New immigrants were more likely to settle in urban ethnic enclaves
The 20th century was the period between January 1, 1901 and December 31, 2000.So yeah 1936 is a part of 20th century.
The 20th
20th century