Answer:
The chart in question could be a useful source to help explain why historians refer to the slave trade within the United States as the "second middle passage" due to several reasons. Firstly, the chart may provide data and statistics that highlight the magnitude and scale of the domestic slave trade in the United States. By examining the numbers of enslaved individuals transported within the country, historians can draw parallels between this internal trade and the transatlantic slave trade, which was known as the "middle passage."
Step-by-step explanation: