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States (and countries) in each region are:
Region 1: Alaska, Arizona, California, Colorado, Hawaii, Idaho, Illinois, Iowa, Kansas, Minnesota, Missouri, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oregon, South Dakota, Utah, Washington, Wisconsin, Wyoming. Also included are Canada, East Asia, the Pacific Islands, and Western Europe
Region 2: Arkansas, Louisiana, Oklahoma, and Texas. Also included are South America, Mexico, and the Middle East.
Region 3: Alabama, Connecticut, Indiana, Kentucky, Maine, Massachusetts, Michigan, Mississippi, New Hampshire, New Jersey, New York, Ohio, Rhode Island, Tennessee, and Vermont. Also included is Eastern Europe.
Region 4: Delaware, District of Columbia, Florida, Georgia, Maryland, North Carolina, Pennsylvania, South Carolina, Virginia, West Virginia. Also included are the Caribbean, Puerto Rico, and Africa.