What event seemed to start the great migration?

The freeing of slaves looking to start a life of their own.

The economic conditions of World War I led to a massive movement of African Americans from the South to the North, known as the Great Migration

Explanation:

Simply put there were too many low-paying jobs in the south during this time period, so many black Americans went north for better economic opportunity.

If you need more context let me know! :)

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explanation:

a change of venue is the legal term for moving a trial to a new location. a change of venue request because venue is improper means that the removing defendant believes that the case may not be in that venue because it is improper under procedural rules.