Final answer:
The South Carolinian flag was changed due to the patriots defending Sullivan’s Island against the British, reflecting unity and strength in the fight for independence during the Revolutionary War.
Step-by-step explanation:
The flag of South Carolina was changed at the beginning of the Revolutionary War due to a significant event in which Patriots successfully defended Sullivan’s Island against the British. On June 28, 1776, the patriots held off the British during the first battle of Sullivan's Island, which was a major victory for the American forces. This event helped to cement the identity and unity of South Carolinians against the British and demonstrated the effectiveness of the regulars and partisan bands working together. The victory also likely played a role in the state's decision to adopt a new flag, symbolizing their commitment to the revolutionary cause and their newfound strength as a unified fighting force against the British aggression.