Final answer:
The United States adopted the Articles of Confederation to organize the national government after declaring independence.
Step-by-step explanation:
The document adopted by the United States to organize the national government after declaring independence was the Articles of Confederation. The Articles of Confederation was the first constitution of the United States, established in 1781. It created a weak central government and granted most powers to the individual states, resulting in issues with governance and eventual replacement by the Constitution.
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