Which states would go to which nation? That depends upon whether you assess a state as Red or Blue, and on that point there is some dispute. Here’s one of the best red-versus-blue maps that I found:
This shows how solidly red or blue each state is. I would break this down into three groups: Red, Blue, and Undecided. This then would be the division of states:
Blue
California
Oregon
Washington
New Mexico
New York
Maine
New Hampshire
Vermont
Massachusetts
Connecticut
Rhode Island
New Jersey
Maryland
Pennsylvania
Ohio
Michigan
Wisconsin
Minnesota
Hawaii
Illonois
Red
Idaho
Utah
Wyoming
South Dakota
North Dakota
Kansas
Utah
Nebraska
Oklahoma
Texas
Alabama
Mississippi
South Carolina
Undecided
Nevada
Arizona
Montana
Colorado
Ohio
Missouri
Arkansas
Louisiana
Indiana
Kentucky
Tennessee
North Carolina
Georgia
Florida
West Virginia