Why did the French build Fort Duquesne?

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Painting of Edward Braddock and British troops in uniform advancing through dense forest, facing Native American and French fighters during the French and Indian War near Fort Duquesne. — French and Indian War British commander Edward Braddock and his troops preparing to march on the French-held Fort Duquesne (now Pittsburgh, Pennsylvania) during the French and Indian War.

The French built Fort Duquesne at the confluence of the Allegheny and Monongahela rivers to consolidate their military and territorial positions in the upper Ohio River valley.1

During the mid-18th century, the French sought to secure their claims to the Mississippi and Ohio River basins against expanding British colonial interests. By constructing a series of forts on the headwaters of the Allegheny, the French aimed to drive out British traders—whom they viewed as trespassers—and maintain control over the region's vital trade routes and alliances with Indigenous peoples. This strategic fortification was a direct response to the growing presence of Virginians and Pennsylvanians in the area, ultimately serving as a key flashpoint in the French and Indian War.213