Which 1777 American victory helped persuade France to enter a formal alliance with the United States?

The Battle of Saratoga was the 1777 American victory that helped persuade France to enter a formal alliance with the United States.

The Saratoga campaign took place in northern New York during the Revolutionary War. British General John Burgoyne led an army south from Canada, intending to cut New England off from the other American colonies. American forces gradually surrounded his army, and Burgoyne surrendered at Saratoga on October 17, 1777. The campaign included the battles of Freeman’s Farm and Bemis Heights, although the surrender is often described simply as the American victory at Saratoga.

News of the result strengthened France’s confidence that the American rebellion could succeed. France had already provided secret aid, but the victory encouraged open diplomatic and military cooperation. On February 6, 1778, France and the United States signed the Treaty of Amity and Commerce and the Treaty of Alliance. French financial support, troops, naval forces, and military supplies became extremely important, especially during the Yorktown campaign. Saratoga is therefore remembered not only as a battlefield success but also as a major diplomatic achievement for the American cause.