premise: Phoenix, Arizona is a state.
hypothesis: Phoenix ( [ ˈfiːnᵻks ] ) is the capital and most populous city of the U.S. state of Arizona . With 1,615,017 people , Phoenix is the fifth most populous city nationwide , the most populous state capital in the United States , and the only state capital with a population of more than one million residents . In addition , Phoenix is the seat of Maricopa County and , at 517.9 square miles ( 1,341 km2 ) , it is the largest city in the state , more than twice the size of Tucson and one of the largest cities in the United States . Phoenix is the cultural center of the Valley of the Sun , as well as the entire state .