Because the south in large part were built on slaves. They didn't have factories or anything like the north did. They had cotton and assorted vegetables. In large part many will say that is also what lost them the war.
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Answer:
The main cause was that a few exports had increased European demand. After the war the economy slowed, causing increasing political unrest. Population growth, swelled by heavy immigration, contributed to urban concentration and increased social problems.
Explanation:
They moved to the mestopotamias and lived there, expanded their land.