The full text of the United States Constitution is available on the U.S. senate website, senate.gov. This website contains all sections of every article and all subsequent amendments to the constitution.
The U.S. Constitution is the country's founding document and supreme law of the land. The nation's original Articles of Confederation established a Congress of the Confederation as a central governmental unit, but its powers were extremely limited and often ineffectual.
In May 1787, delegates from 12 of the 13 states met in Philadelphia to begin drafting a new document that would allow a central government to have enough power to act on a national level, but not so much power that fundamental rights would be at risk. By May 1790, after much debate, all states had ratified the U.S. Constitution.