Conversation so far:
When did he begin to explore the Cherokee nation?
On April 22, 1775 Bartram left Charleston, South Carolina on horseback to explore the Cherokee Nation.
Did others accompany him?
CANNOTANSWER.
Where was the Cherokee nation?
a few days later he left Fort Prince George and Keowee.

Question: What did he find there?
Self-contained rewrite: What did William Bartram find in the Cherokee nation?