By Sean MurphyAssociated PressADA — Oklahoma's history is so deeply intertwined with the 39 Native American tribes located there that the state's creation in 1907 was celebrated with a symbolic wedding ceremony between the Indian and Oklahoma territories.The relationship between Oklahoma and the tribes has sometimes been contentious, but one of its undisputed successes has been a 15-year-old agreement to expand gambling in the state.Since the tribes got the exclusive right to open casinos, Native American gambling has become a bigger economic factor in Oklahoma than in any other state except California.Read more on NewsOK.com