Sector Seven was a secret American government organization formed to be a hidden defense force.
Sector Seven was founded in 1913 by The First Seven after they discovered the AllSpark. By the 1930's, President Hoover had built the Hoover Dam to house the Allspark, and the dam eventually became to secret base of operations of the agency. Megatron was also shipped to the Hoover dam following Sector Seven's discovery of him in the Arctic Circle. As a result, Sector Seven was able to reverse engineer technology of the modern age such as spaceflight, microchips, and cars.