Which document served as the first constitution of the United States in the history behind America's 250th anniversary?

The Articles of Confederation served as the first constitution of the United States in the history behind America's 250th anniversary.

The Articles created a loose union of the thirteen states during the Revolutionary era. Congress approved them in 1777, but they did not take effect until Maryland became the final state to ratify them in 1781. The document established a national Congress while leaving most powers with the states.

Under the Articles, Congress could conduct diplomacy, manage western lands, and direct the war effort, but it could not impose federal taxes or regulate interstate commerce effectively. The weaknesses became increasingly apparent after the war, especially during disputes over finance and trade.

The Articles were replaced by the U.S. Constitution, which was drafted in 1787 and took effect in 1789. Thus, the Constitution is the current framework of government, but it was not the first national constitution.