The Articles of Confederation served as the written document that established the functions of the national government of the United States after it declared independence from Great Britain.
The Articles of Confederation was the first Constitution in the national government of the United States which meant that it was the first constitution to establish a national U.S. government. The preservation of the states power' freedom and independence was a driving concept of the Articles.
However, it needed to be replaced because it had created a very weak national government and by so doing, threatened the unity of the nation because the national government might be unable to keep states from going against each other.
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