how did france try to protect its land claims in the ohio river valley
New France Fort Duquesne, located at the confluence of the Allegheny and Monongahela Rivers at the site of present-day Pittsburgh, Pennsylvania, guarded the most important strategic location in the west at the time of the Seven Years' War. It was built to insure that the Ohio River valley remained under French control. A small colonial force from Virginia began a fort here but a French force under Claude-Pierre Pécaudy de Contrecœur drove them off in April 1754. New France claimed this as part of their colony and the French were anxious to keep the British from encroaching on it. The French built Fort Duquesne here to serve as a military stronghold and as a base for developing trade and strengthening military alliances with the Aboriginal peoples of the area.