Final answer:
Benjamin Franklin admired the Iroquois League's union and was inspired by it to promote colonial unity and incorporate democratic principles from the Iroquois into the United States Constitution, acknowledged by Congress in 1988.
Step-by-step explanation:
Benjamin Franklin viewed the Iroquois League, also known as the Iroquois Confederacy, as an inspiration for colonial unity. In his 1751 letter to James Parker, Franklin admired the union of the six tribes of the Iroquois Nation, from which he drew inspiration for the "Join or Die" slogan that later fueled the fight for independence from the British.
The United States Congress, via the Concurrent Resolution 331 of the 100th Congress in 1988, acknowledged that the political systems and democratic principles of the Iroquois Confederacy had a significant influence on the constitutional framework of the United States. Additionally, Franklin's Albany Plan during the French and Indian War sought to establish a formal colonial union, inspired by the governance of the Iroquois League.