Alaska is an American territory in the Arctic region of North America. It is the location of Fort Anchorage, the largest American military base built in the 1930's, where America's first nuclear weapon was constructed and first detonated in June 1944. There was another such military installation in Alaska, a extension of Project Abraham, where its location has yet to be declassified, however it could possibly be the Fort Greeley referenced in Popular Technologies. Alaska has become under Grey Territory as of a little after the events of Project Abraham.
It is not given whether Alaska is a territory or a state (which was officially admitted into the Union in 1959 in real life) given the Resistance series' alternate history.