I've done this one before in a similar thread. My main changes are to shift the Mid Atlantic further south, and to create a Southwest region from states that have a significant Latino influence (but leaving CA in the Pacific).
Region 1: the Northeast
Division 1A: New England (CT, ME, NH, VT, MA, RI)
Division 1B: Mid-Atlantic (NY, NJ, PA, DE, MD, DC, WV)
Region 2: the South
Division 2A: Atlantic South (FL, GA, NC, SC, VA)
Division 2B: Delta South (AL, AR, KY, LA, MS, TN)
Region 3: the Midwest
Division 3A: Great Lakes (IL, IN, MI, OH, WI)
Division 3B: Great Plains (IA, KS, MN, MO, NE, ND, OK, SD)
Region 4: the West
Division 4A: Rocky Mountain (CO, ID, MT, NV, UT, WY)
Division 4B: Southwest (AZ, NM, TX)
Division 4C: Pacific (AK, HI, WA, OR, CA)
