The authority to make law was given to the legislatures. That is the essence of republican govm't. Constitutional amendm't is used to modify scope, powers and mechanics of govm't.
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If men through fear, fraud or mistake, should in terms renounce and give up any essential natural right, the eternal law of reason and the great end of society, would absolutely vacate such renunciation; the right to freedom being the gift of God Almighty, it is not in the power of Man to alienate this gift, and voluntarily become a slave.
John Adams, Rights of the Colonists, 1772
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The Founders called it Natural law, or the law of Nature and nature's God in the Declaration of Independence.
It's WHY the Declaration was separate from the Constitution
It's WHY the Bill of Rights were separated from the Constitution
It's WHY we're in such a major mess now because SO FEW PEOPLE understand the beautifully simple system of Natural law left to us by the Founders....
It's WHY America WAS considered FREE!