The states of the US are: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, and Wyoming.
10,000 Lakes: Minnesota
Aloha State: Hawaii
Amber Waves of Grain: Indiana
America's Dairyland: Wisconsin
Big Sky: Montana
Bluegrass State: Kentucky
Celebrate & Discover: Washington, DC
Constitution State: Connecticut
Explore: Minnesota
Famous Potatoes: Idaho
First in Flight: North Carolina
The First State: Delaware
Garden State: New Jersey
Grand Canyon State: Arizona
Great Faces, Great Places: South Dakota
Great Lakes (also Great Lake Splendor): Michigan
Green Mountain State: Vermont
Heart of Dixie: Alabama
the heart of it all: Ohio
Hoosier Hospitality: Indiana
Keystone State: Pennsylvania
Land of Enchantment: New Mexico
Land of Lincoln: Illinois
The Last Frontier: Alaska
Live Free or Die: New Hampshire
The Lone Star State: Texas
Native America: Oklahoma
The Natural State: Arkansas
Ocean State: Rhode Island
OK! (also Oklahoma is OK!): Oklahoma
Georgia...on my mind: Georgia
Preserve the Spirit / Peace Garden State: North Dakota
Putting Families First: South Carolina (after 10/1/97)
Scenic: Idaho
Show-Me State: Missouri
The Silver State: Nevada
Ski Utah! Greatest Snow on Earth: Utah
The Spirit of America: Massachusetts
Sportsman's Paradise: Louisiana
Sunshine State: Florida
Vacationland: Maine
Volunteer State: Tennessee
Wild, Wonderful: West Virginia
The Canadian provinces are: Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland & Labrador, Northwest Territories, Nova Scotia, Ontario, Prince Edward Island, Quebec, Saskatchewan, and Yukon Territory
Beautiful: British Columbia
Canada's Ocean Playground: Nova Scotia
Explore Canada's Arctic: Northwest Territories (which will apparently be divided into two new territories, Denedeh and Nunavut, in 1999).
Friendly: Manitoba (in the '70s, Manitoba's license plate slogan included the phrase "100,000 Lakes," providing tough competition for a certain US state)
Home of "Anne of Green Gables": Prince Edward Island
Je me souviens: Quebec
The Klondike: Yukon Territory
Nouveau: New Brunswick (the "Nouveau" is stacked with the "New," so this only marginally counts as a slogan)
Wild Rose Country: Alberta
A World of Difference: Newfoundland
Yours to Discover: Ontario