Due to the need to stage large forces, I go Bermuda, then to Andros (the airfield in the bahamas). While my fighters achieve air superiority over the florida straight, my tranports are busy staging everybody in the Bahamas. Also I build a level one port in Andros so I can rebase ships there. I then attack Florida and the East coast in order to cut down on the transit times for my transports.
Note - If you want to cut the US down quick, send multiple landings, attacking Florida, the Northeast, and Texas. The AI won't be able to cope and will just shut down and die. If you want the AI to put up a big fight, pick one landing site, and then fight from there. alternatively invade through Mexico for a logistical challenge.