The automobile industry. In particular public transportation (the diesel engine).
There were no jobs in the cities.
grow in car sales
Limited transportation
It encouraged industrial developments across the world
Widespread availability of automobiles.
The growth of suburbs offered many opportunities for business owenrs
the growth of suburbs encouraged innovation in business (apex)
fat boysn
They raised money for the government and encouraged the growth of American industry's.
railroad I believe
mining
mining
The growth of suburbs caused many new types of business to do well. Apex
railroad I believe
There were no jobs in the cities.
Improvements in transportation
There were no jobs in the cities.