In which war did America experience a direct military attack upon its own territory?

Answer 1

World War 2. Both Alaska and Hawaii, which were then territories but not states, were attacked. Japanse tropps occupied Attu Island, Alaska, briefly. A submarine-launched small Japanese plane also dropped a bomb in southern Oregon.
http://www.outwestnewspaper.com/bomboregon.html

Answer 2

All of the above

Answer 3

War 2