Despite the country at-large swinging to the right, Arizona's Republican margin of victory decreased from 9.0% in 2012[2] to only 3.5% in 2016, thus making it one of 11 states (along with the District of Columbia) to swing toward the Democratic Party in this election. Trump's margin of victory in Arizona was the smallest for any Republican who won the presidency since Arizona's founding in 1912, with Calvin Coolidge's 5.8% victory in 1924 being the second closest.
Notably, Maricopa County, the state's most populous county, went more Democratic than the state as a whole for the first time in state history. The county had not voted for a Democrat since Harry S. Truman in 1948. Therefore, Trump's narrow win in the county suggested the Republican Party was losing ground in the state. In fact, the county and the state would go on to vote Democratic in 2020.
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