Question

what are the changes that occurred as the United States shifted from an agrarian to an industrial society?

Answer 1

The change happened as follows: farmers bought tractors, fired farm workers, who moved to the cities and learned to work in factories.

It was very similar to how manufacturing is being replaced by service and high-tech - factories replace workers with machines or Chinese, and former manufacturing workers re-train for service jobs, or write whiny blogs about death of American economy.