Which present US state did the Japanese occupy during World War 2?

I believe the state in question is Alaska. I remember hearing a very recent report on the History Channel program which gave some information that a small force of Japanese had invaded Alaska with the possibility of invading the United States from that remote location. I also remember hearing from a relative that the Japanese also "invaded" Washington state. I don't have any corroborating evidence to the above, but I'm sure you could research the library for actual facts.