Answer: The founders of League are traditionally held to be Dekanawida the Great Peacemaker, Hiawatha.
Step-by-step explanation:
The confederacy was formed around 1350 to 1600 during a dark time of constant wars in between the original five tribes. Dekananwida and Hiawatha were responsible for the confederacy's formation and created a political system that convinced the chiefs from all of the tribes to unite.