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are the best choices in my opinion.
The Great Migration/ The North Migration. The time period was fro 1916 to (I believe) 1970. During this time people migrated from the South to the North because they had so many more opporunities compared to in the South since they had actual factories there.
Answer:
Principal teaching of the Buddha that leads the way to the end of suffering and the achievement of self-awakening. It is the fourth of the Buddha's Four Noble Truths.