Region 1: the Northeast
Division 1A: New England (ME, NH, VT, MA, RI)
Division 1B: Mid-Atlantic (CT, NY, NJ, PA, DE, MD, DC, VA)
Region 2: the South
Division 2A: Inland South (WV, KY, TN, MO, AR, OK)
Division 2B: Coastal South (NC, SC, GA, FL, AL, MS, LA, TX)
Region 3: the Midwest
Division 3A: Rust Belt (OH, MI, IN, IL)
Division 3B: Upper Midwest (MN, WI, IA)
Region 4: the West
Division 4A: "Mountain" West/God's Country (UT, ID, WY, MT, ND, SD, NE, KS)
Division 4B: Southwest (CO, NM, AZ, NV)
Division 4C: Pacific Coast (AK, HI, WA, OR, CA)
4A could maybe become 3C and join with the Midwest. I don't dislike Goldwater's "Great Plains" region, either; in that case, maybe join 4B and the remaining 4A?