Answer:
Deganawida "The great peacemaker" came to the Five Nations that were constantly in belligerence, with a message he had received from The Creator that contained the principles of peace, equality, respect, love and justice.
He unified the nations as in a "Communal House" where each had its own fire. In the center - Onondaga Territory - The Great Peace Tree was planted, its branches represented the homes in the Confederate nations and its roots extended to the four cardinal points, invited other peoples to take refuge in it.
The symbolism used was that the tree was a symbol of the unity of the nations.
Symbolism simply means the use of symbols in order to illustrate a particular point to the readers.
In this case, the authors purpose in using tree roots as the symbol for the Iroquois confederacy was to depict unity among the nations.
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