The best summary of the division of political power between the backcountry and lowcountry in the eighteenth century is:
Wealth provided people with political power, and people in the lowcountry tended to have most of the wealth in South Carolina.
This statement accurately reflects the socio-economic dynamics of the time, where the lowcountry, being more economically prosperous and influential, held more political power compared to the less wealthy backcountry.