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The introduction of the private automobile was a significant contributor to the Florida land boom of the 1920s.
Actually, the land boom in the 1920's was interrupted by a series of natural disasters in Florida, including freezes and hurricanes.
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the industries that went into decline were:
-CoalMining.
-Shipbuilding.
these industries did not prosper in the boom in the 1920s.
The crash, boom and bust, with lots of excess and spending were the boom years. All of these led to the Great Depression in 1929.