The correct answer to this open question is the following.
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The idea for the 13 colonies to unite under one "federal government", was born from Benjamin Franklin's work with Native Americans in Pennsylvania. He convinced other colonial leaders to model a democratic form of government inspired by the Iroquois League of Nations.
At the end of the 1500s, five Native American Indian tribes decided to join forces and formed what was known as the Iroquois League of Nations. They basically created this association to fight their common enemy, the Huron Indians.
The Native American Indian tribes that formed the league were the Seneca, Mohawk, Oneida, Cayuga, and Onondaga.
American Founding Father Benjamin Franklin, took the idea from the strong position of this league and shared with other colonists leaders to form a united nation.