The historical fact that is supported by the excerpt is "Enslaved people were forced to work under inhumane conditions," as further explained below.
What is a historical fact?
A historical fact is an event that has taken place at some point in the past. Historical facts, therefore, refer to real-life events, not to fictional ones. However, fiction literary works often present ideas, descriptions, or events that support a historical fact.
In the excerpt we are analyzing here, we see the inhuman conditions under which enslaved people were forced to work. Such conditions are a historical fact, as we have proof of the inhuman treatment given to slaves.
Learn more about historical facts here:
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