Calling itself "America's Friendliest State," North Dakota offers hospitality, Native American and Scandinavian cultural experiences, hilly Great Plains landscapes, and hunting. North Dakota's economy is supported by fossil fuels and agriculture, particularly petroleum, coal, and grains. North Dakota hosts one of the largest powwows in the United States every September, where thousands of spectators and more than 70 tribes gather to sing, dance, and play drums and music.