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The goal was to tell the rest of the world (mainly the Europeans) that the United States has official borders and that they could no longer colonize in the borders.
It also told the Europeans that the U.S would not interfere with their colonies or Europe itself.
Vote in national elections
Well the exact translation of Islam is submission. So the belief in the existence of the Islamic god Allah, as well as angels. Belief that the Quran is legitamite. Then there's other stuuf like the Gospel (showed to Jesus), the Torah (Moses), then finally Psalms (David). Bascially saying like submit yourself to Allah and what not.