<Table> <Tr> <Th_colspan="2"> United States Constitution </Th> </Tr> <Tr> <Td_colspan="2"> Page one of the original copy of the Constitution </Td> </Tr> <Tr> <Th> Created </Th> <Td> September 17, 1787 </Td> </Tr> <Tr> <Th> Ratified </Th> <Td> June 21, 1788 </Td> </Tr> <Tr> <Th> Date effective </Th> <Td> March 4, 1789; 229 years ago (1789 - 03 - 04) </Td> </Tr> <Tr> <Th> Location </Th> <Td> National Archives, Washington, D.C. </Td> </Tr> <Tr> <Th> Author (s) </Th> <Td> Philadelphia Convention </Td> </Tr> <Tr> <Th> Signatories </Th> <Td> 39 of the 55 delegates </Td> </Tr> <Tr> <Th> Purpose </Th> <Td> To replace the Articles of Confederation (1777) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> United States Constitution </Th> </Tr>

When was the constitution of the usa written