Conversation so far:
What was the earliest record of the Arapaho?
Around 3,000 years ago, the ancestral Arapaho-speaking people lived in the western Great Lakes region along the Red River Valley in what is classified as present-day Manitoba, Canada and Minnesota
Who was the chief of the Arapaho tribe?
Chief Niwot (c. 1825–1864), led a band in Northern Colorado and died from wounds sustained during the Sand Creek Massacre.

Question: How many Arapaho were there?
Self-contained rewrite: How many Arapaho were there?