I am a resident of the state of North Carolina. We are sometimes known as Tarheels. This nickname for the citizens of Old North originates with the derisive "tar boiler" referring to the poor whites who rendered pine pitch into tar and turpentine for His Britannic Inbredfulnesses Redcoat Boat Club. During both the Revolutionary War and the Civil War, Carolinians gained a reputation for stubborn tenacity. Carolinian patriots frustrated General Cornwallis by flooding the Tar river with pitch. North Carolina was the nest-to-last to secede from the union, earning a reputation as "the reluctant state." A Texan regiment teased a Carolina regiment by shouting "Tarheels!" The reply was "If you had some tar on your heels, maybe you'd have brought back your flag from Sharpsburg!" The term has become a badge of pride, a mark of tenacity, quite literal sticktoitiveness.
Residents of Ohio are called Buckeyes, after a local species of useless, toxic nut.