It was a flow of African Americans moving from the South to the North.
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The United States government had a history of human experimentation in mind control to control information flow.
The Churchill Barriers .
So war supplies needed to flow freely from the United States to Great Britain
A British home base for their Atlantic fleet,I believe the ships used in the destruction of the Bismark came from here.
Stopping the flow of raw material had much to do with Japan's plans for conquest and war.