Conversation so far:
what were the melungeon origins?
Children of European and free black unions had intermarried with persons of Native American ancestry.
Are there any other interesting aspects about Melungeon?
The term Melungeon has since sometimes been applied as a catch-all phrase for a number of groups of mixed-race ancestry.

Question: what was their greatest accomplishment?
Self-contained rewrite: what was the Melungeon's greatest accomplishment?