In an effort to overturn the pro-slavery lie that African Americans would not work without the threat of the?

In an effort to overturn the pro-slavery lie that African Americans would not work without the threat of the lash, under freedom African American women left the big house to work in the field in large numbers.

Is this sentence true or false? I am having a hard time trying to figure this one out, thanks!

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Orignal From: In an effort to overturn the pro-slavery lie that African Americans would not work without the threat of the?