Articles of Confederation, first U.S. constitution (1781–89), which served as a bridge between the initial government by the Continental Congress of the Revolutionary period and the federal government provided under the U.S. Constitution of 1787. Because the experience of overbearing British central authority was vivid in colonial minds, the drafters of the Articles deliberately established a confederation of sovereign states. The Articles were written in 1776–77 and adopted by the Congress on November 15, 1777. However, the document was not fully ratified by the states until March 1, 1781.