All the new technical advancements, everything was cheaper so people could afford food and move to the city also with all the new traveling advancements it made it easier to transfer products from place to place.
Families were forced to move out of their homes on the farm and move into the city where it was polluted. Children had to work in factories, coal would fill their lungs and the pay was not enough for all the labor.
The Present: The Digital Revolution
Causes from 1970 all the way to now