Why was the Iroquois League formed?

Basically to defend themselves against enemies.

Five American Indian tribes, sharing the Iroquois language, form a defensive league in the late 16th century against their enemies, the Huron. ... According to Indian tradition the league is founded by Hiawatha, a leader of the Mohawks, on the inspiration of a holy man, Deganawidah.

answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44

a.tensions between the colonial elites and the backcountry men of virginia.