Kalyani Saxena

For nearly 30 years, Arizona has been a steady and unassailable red.

The Republican stronghold last voted for a Democrat for president in 1996 when Bill Clinton was reelected. Donald Trump won Arizona in 2016 by 4 points. And yet this year, despite a tight contest, The Associated Press and other news outlets including CNN, The New York Times and The Washington Post, have all called Arizona for Joe Biden.

Updated on Monday at 11: 05 a.m. ET

For many Americans, presidential elections essentially end when a candidate is declared the winner. This year, after several days of tense waiting and watching, The Associated Press called the presidential race Saturday morning, declaring that former Vice President Joe Biden will become the 46th president of the United States.