I've never actually mapped it out, but I have a general idea of how I'd want my "Tour of the United States" to go...
Prologue: Down the Las Vegas Strip
Stage 1: Las Vegas to Death Valley (medium mountain)
Stage 2: Death Valley to Whitney Portal (MTF)
Stage 3: Transitional down I-395
Stage 4: Through Angeles National Forest to Los Angeles (mountain)
Transfer to Aspen, Rest Day
Stage 5: Independence Pass to Leadville (mountain)
Stage 6: Mount Evans Climb Time Trial (MTF, obviously)
Stage 7: Through Estes Park (MTF)
Stage 8: Denver Circuit Race (early), transfer to DC that night
Stage 9: DC to Front Royal
Stage 10: Skyline Drive (medium mountain)
Stages 11-13: Blue Ridge Parkway, finishing Stage 13 at Clingman's Dome (all mountains, all could easily be MTFs)
Stage 14: Gatlinburg to Chattanooga
Stage 15: Chattanooga to Atlanta
Rest Day, Transfer to Boston
Stage 16: Boston to Manchester, NH
Stage 17: Manchester to Mount Washington (MTF)
Stage 18: Burlington, VT to Lake Placid, NY (probably could be moved to become an MTF)
Stage 19: Utica, NY to Ithaca, NY
Stage 20: New York City Time Trial