France was the most important foreign ally of the United States during the Revolutionary War. The French government provided significant financial aid, as well as military support in the form of troops, ships, and supplies. The French also played a key role in securing the decisive victory at Yorktown in 1781, which ultimately led to the British surrender.
Spain also provided significant assistance to the American cause, primarily in the form of financial aid and military supplies. Spain's support was motivated in part by its rivalry with Great Britain and its desire to regain control of territories lost to the British in previous conflicts.
The Netherlands provided financial support to the United States, as well as allowing American ships to use its ports. The Dutch were motivated by their commercial interests and their desire to maintain their neutrality in the conflict.
In addition to these major allies, several other foreign nations, including Prussia, Russia, and Austria, also provided some level of support to the United States during the Revolutionary War. These nations often provided diplomatic recognition, moral support, or military supplies.
The assistance provided by foreign allies was crucial to the American victory in the Revolutionary War. The financial aid, military support, and diplomatic recognition from these nations helped to bolster the American cause and ultimately led to the defeat of Great Britain.