Factbox: These states could decide the U.S. presidential election

FILE PHOTO: U.S. President Donald Trump and Democratic presidential nominee Joe Biden participate in the final presidential debate at the Curb Event Center at Belmont University in Nashville, Tennessee, U.S., October 22, 2020. Chip Somodevilla/Pool via REUTERS

(Reuters) - The U.S. presidential election will be decided by about a dozen states that could swing to either President Donald Trump, a Republican, or his Democratic challenger Joe Biden.

These states will play a critical role in delivering the 270 Electoral College votes needed to win the White House. Due to a surge in mail voting amid the coronavirus pandemic - as well as the states' varying rules for when ballots can be counted - the final results for all the states are expected to take days to be revealed.