Question

which is the bests explanation for why many american indians tribes sided with the french during the french and indian war

Answer 1

Both Great Britain and France wanted to expand their colonies into the Ohio River Valley, which France considered a part of New France and Great Britain considered a part of the colony of Virginia.  Many American Indians also fought in the war because their tribes either lived in the disputed areas, were allied with the tribes who lived there or were allied with either the French or the English.