Premise: The 2013 USA Outdoor Track and Field Championships was held at Drake Stadium in Des Moines, Iowa. Organised by USA Track and Field, the four-day competition took place June 20–23 in conjunction with the USA Junior Outdoor Track & Field Championships which started the day before and served as the national championships in track and field for the United States.
Hypothesis: The Track and Field Championships are a national level event for track and field in the United States of America.