Conversation so far:
What is this about?
The ancestry and identity of Melungeons has been a highly controversial subject.
What do the others say?
Secondary sources disagree as to their ethnic, linguistic, cultural, and geographic origins and identity, as they are of mixed racial ancestry.
What could be be said?
They might accurately be described as a loose collection of families of diverse origins who migrated, settled near each other, and intermarried.

Question: Who was this about?
Self-contained rewrite: Who was the description of being a loose collection of families with diverse origins about?