It would be between increased population, a steady stream of agricultural production, and technological advancements. As for the most important one of those three; that would be agricultural production.
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The answer is c because when they leave they are pushed and when they are attracted they are pulled.
In 1865 and 1866, after the civil war. I'm not sure who wrote them
Advances in technology, new industries, growth of cities and new forms of transportation.