A group of 54 cruisers, 30 battleships, and 80 aircraft carriers approach the shores of Washington. To support them over 1200 fighter-bombers are following them. Hundreds of transport vessels carrying soldiers are also brought along. The 1200 aircraft start to bombard any defenses or military bases near the coast . They also attack ports carrying N.U.S.A. ships along the shoreline. After the attacks, the convoy of ships land in Washington. The transport vessels carrying over 45,000 Alaskan soldiers land first. The cruisers and battleships support them, navally bombarding any N.U.S.A. forces near the beachheads. 20 more cruisers and 12 more battleships are on the way in case things go south.
By the way, I'm sure that the vast majority of N.U.S.A. forces are on the other side of North America.