In a North-South divide, Delaware is usually in the South. It may be in the Northeast, but I wouldn't consider it part of the North.
I am offering an amendment. I believe that this alternate regional composition makes more historical sense.
Philly Metro Area Belongs Together Constitutional Amendment Correction of Regions Constitutional Amendment
Section 1. The Regions.
1. The several states of this Republic shall be apportioned among three contiguous, autonomous Regions. Each region shall be further subdivided into two subregions.
2. The northern Region shall consist of the states of Connecticut, Delaware, Illinois, Indiana, Iowa, Maine, Massachusetts, Michigan, Minnesota, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Wisconsin, Vermont, and Atlasian Virgin Islands.
i. The Northeastern Subregion shall consist of the states of Connecticut, Delaware, Maine, Massachusetts, New Hampshire, New York, Pennsylvania, Rhode Island, Vermont, and Atlasian Virgin Islands.
ii. The Great Lakes Subregion shall consist of the states of Illinois, Indiana, Iowa, Michigan, Minnesota, Ohio, Pennsylvania, and Wisconsin.
3. The southern Region shall consist of the states of Alabama, Arkansas, Delaware, Florida, Georgia, Louisiana, Kansas, Kentucky, Maryland, Mississippi, Missouri, North Carolina, Oklahoma, Puerto Rico, South Carolina, Tennessee, Texas, Virginia, West Virginia, and the District of Columbia.
i. The Upper Southern Subregion shall consist of the states of Arkansas, Delaware, Kansas, Kentucky, Maryland, Missouri, North Carolina, Oklahoma, Tennessee, Virginia, West Virginia, and the District of Columbia.
ii. The Deep Southern Subregion shall consist of the states of Alabama, Florida, Georgia, Louisiana, Mississippi, Puerto Rico, South Carolina, and Texas
4. The western Region shall consist of the states of Alaska, Arizona, Atlasian Samoa, California, Colorado, Guam, Hawaii, Idaho, Iowa, Kansas, Montana, Minnesota, Nevada, New Mexico, North Dakota, Northern Mariana Islands, Nebraska, Oregon, South Dakota, Utah, Washington, and Wyoming.
i. The Mountain West Subregion shall consist of the states of Arizona, Colorado, Idaho, Iowa, Kansas, Montana, Minnesota, Nevada, New Mexico, North Dakota, Nebraska, South Dakota, Utah, and Wyoming.
ii. The Pacific Subregion shall consist of the states of Alaska, Atlasian Samoa, California, Guam, Hawaii, Northern Mariana Islands, Oregon, and Washington.