What contributed to Trump's loss in Arizona?

[TML]

Remember that 2016 marked the first time in history that Maricopa County voted more Democratic than the state at-large. This county had been the main reason AZ voted Republican in almost every election since the second half of the 20th century, and that occurrence should have been a clear indication that the state was ripe for flipping due to suburban shifts toward Democrats that have previously caused states like CO and VA to flip in the late 2000s. Additionally, the fact that Democrats flipped a Senate seat there in 2018, combined with the fact that the loser of that Senate contest was then appointed to the other Senate seat which was up for a special election in 2020, gave Democrats extra confidence that they could flip this state in 2020 by contesting it sufficiently.