The Sullivan Expedition was a United States military campaign ordered by General George Washington during the American Revolutionary War in response to the destruction of American settlements by the Iroquois and their Loyalist allies. The attacks on the Wyoming Valley and Cherry Valley prompted Washington to authorize a major offensive against the four British-allied nations of the Iroquois Confederacy, with the explicit aim of achieving "the total destruction and devastation of their settlements."
The campaign took place from June to October 1779 and was commanded by General John Sullivan. Four Continental Army brigades executed a scorched-earth military strategy throughout the territory of the Iroquois Confederacy in what is now central New York. This coordinated multi-brigade operation represented a significant commitment of Continental forces toward neutralizing the threat posed by the Iroquois and their British allies in the region.
The expedition achieved substantial military success, resulting in the destruction of 40 Iroquois villages and the systematic destruction of their crops and food stores. The campaign forced just over 5,000 Iroquois to seek refuge at Fort Niagara under British protection and effectively depopulated the area. This depopulation facilitated American settlement of the region in the post-war period. Scholars have debated the expedition's historical significance, with some characterizing it as an attempt to annihilate the Iroquois and describing the campaign as genocide, though this terminology remains disputed among historians.
European colonization of North America accelerated after 1600, with England, France, Spain, and the Netherlands establishing competing settlements along the Atlantic coast, the St. Lawrence River, the Gulf of Mexico, and the Mississippi Valley. The first permanent English settlement at Jamestown, Virginia (1607) struggled with starvation and conflict; the Plymouth colony (1620) and the Massachusetts Bay Colony (1630) followed. By the mid-1700s, thirteen English colonies stretched along the Atlantic seaboard, governed through a mix of royal charters, proprietary grants, and elected assemblies. The colonial economy depended on tobacco in Virginia and Maryland, rice and indigo in the Carolinas, and maritime trade in New England — all increasingly reliant on enslaved African labor after 1619. Conflict with Indigenous peoples over land was continuous, punctuated by major wars including King Philip's War (1675–1676) in New England and the Yamasee War (1715–1717) in the South. The French and Indian War (1754–1763), part of the global Seven Years' War, ended French power in North America and left Britain deeply in debt — triggering the taxation disputes that would lead to revolution.
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