What change made by the Cherokee most helped them to preserve their history?

The adoption of a written language, developed by Sequoyah in the early 19th century, was a crucial change that helped the Cherokee preserve their history. By creating a syllabary, they enabled the documentation of their stories, traditions, and legal matters, fostering a sense of identity and continuity. This literacy allowed them to record their history in written form, ensuring that their cultural heritage could be passed down through generations despite external pressures.