Oklahoma National History Day is more than an academic exercise for thousands of Oklahoma junior high and high school students; it is a tradition. On Wednesday, May 3, and Thursday, May 4, more than 200 6th- through 12th-grade students will present their exhibits, documentaries, performances, websites, and papers at the Oklahoma History Center in Oklahoma City for the opportunity to advance to the National History Day® contest held each summer in the nation's capitol. Due to the size of the…