Northeast
States included: Maine, Massachusetts, Rhode Island, Connecticut, New Hampshire, Vermont, New York, Pennsylvania, New Jersey, Delaware, Maryland
Southeast
States included: West Virginia, Virginia, Kentucky, Tennessee, North Carolina, South Carolina, Georgia, Alabama, Mississippi, Arkansas, Louisiana, Florida
Midwest
States included: Ohio, Indiana, Michigan, Illinois, Missouri, Wisconsin, Minnesota, Iowa, Kansas, Nebraska, South Dakota, North Dakota
Southwest
States included: Texas, Oklahoma, New Mexico, Arizona
West
States included: Colorado, Wyoming, Montana, Idaho, Washington, Oregon, Utah, Nevada, California, Alaska, Hawaii
Other Regions
Here are some other sub-regions that are often referred to:
Mid-Atlantic - Virginia, West Virginia, Pennsylvania, Maryland, Delaware, New Jersey
Central Plains - Iowa, Missouri, Kansas, Nebraska
Great Lakes - Minnesota, Wisconsin, Illinois, Indiana, Ohio, Michigan
New England - Maine, Vermont, New Hampshire, Massachusetts, Rhode Island, Connecticut
Pacific Northwest - Washington, Oregon, Idaho
Rocky Mountains - Utah, Colorado, New Mexico, Wyoming, Montana