The most accurate comparison of the demographics of those living in the lowcountry and backcountry of South Carolina is:
The lowcountry had a majority enslaved Black population with a White minority, while the backcountry had a majority White population with an enslaved Black minority.
This reflects the historical demographics of the regions, with the lowcountry being heavily agrarian and reliant on slave labor, while the backcountry had a more diverse population with a higher proportion of White settlers.