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Broadly there are three reasons for the greater stability of white society in South Carolina -
1. Agriculture success - Due to high fertile land, Rice and Indigo cultivation produced great results.
Economic activities and use of harbor - Trade in deer skin and beef
along with construction of dams and canals. Slave labors were easily
available to carry out the work due to higher wages.
3. Religious tolerance - Settlement from Jews and French was not only tolerated but welcomed.
Hence economic well being coupled with religious tolerance were the main reason for stable society. Please let me know if you need any clarification. I'm always happy to answer your questions. Kindly best this answer if it has helped you.