https://www.u-s-history.com/pages/h840.html . King William’s War was the first in a series of colonial conflicts between France and England for supremacy in North America. The major goal, other than prestige, was the control of the fur trade. All of these struggles had European counterparts that were often of greater significance than the American events.
“King William" refers to William III of England, the new monarch imported from the Netherlands at the time of the Glorious Revolution in 1688-89. The new king allied himself with the League of Augsburg (certain German states, Spain and Sweden) to oppose the French expansion. The Austrians and the Dutch also joined the fray against Louis XIV in the European phase of the conflict.
Conflict was already smouldering on the New England frontier at the time of the English declaration of war against France in May of 1689. Angered over the plundering of St. Castine's Trading House, the French had incited the Abernaki Indians of Maine to destroy the rival English post of Pemaquid, and also to attack frontier settlements.