<Tr> <Td_colspan="2"> The Trinity test of the Manhattan Project was the first detonation of a nuclear weapon . </Td> </Tr> <Tr> <Th> Active </Th> <Td> 1942--1946 </Td> </Tr> <Tr> <Th> Disbanded </Th> <Td> 15 August 1947 </Td> </Tr> <Tr> <Th> Country </Th> <Td> United States of America United Kingdom Canada </Td> </Tr>

The key facilities for development and production of the american atomic bomb were located in