Final answer:
In 2020, the presidential election took a few days to be called in favor of Joe Biden due to the high number of mail-in and absentee ballots and the close margins in some battleground states.
Step-by-step explanation:
In 2020, it took a few days for the presidential election to be called in favor of Joe Biden due to several reasons. One main reason was the large number of mail-in and absentee ballots that needed to be counted. These ballots take longer to process and verify compared to in-person votes. Additionally, there were close margins in some key battleground states, which meant the votes needed to be meticulously tabulated and verified to ensure accuracy.
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