Election Day is right around the corner. With national polls pointing toward a tight race between Vice President Kamala Harris and former President Donald Trump, all eyes are on a handful of swing states. However, the swing state roster has changed since the 2020 presidential election. So, what are the key states to watch come Election Day? Swing states are typically defined as areas that have similar levels of support for each political party's candidate that can have a key role in the outcome of the presidential race.Seven states in two regions of the U.S. could have a major impact on the outcome of the 2024 election. The 'Blue Wall' statesThe so-called "Blue Wall" states of Michigan, Wisconsin, and Pennsylvania are on the list of swing states. Trump won all three states in 2016, but President Joe Biden gained them back in 2020. Wisconsin is specifically seen as one of the most competitive states, as President Joe Biden had previously won by fewer than 21,000 votes in the 2020 election.The Sun Belt statesThe Sun Belt states of Arizona, Nevada, Georgia and North Carolina have also made it onto the list. This is due to a combination of an increase of Latino, Asian American and young Black voting demographics in the region. But North Carolina and Georgia could still be wild cards, as North Carolina has historically leaned Republican. Most notably missing from the list of swing states is the industrial midwest: Ohio and Iowa have recently leaned more Republican. According to an analysis by NPR, the change is due to the shift toward the GOP among white voters without college degrees. Prior to the Trump era, Ohio and Iowa were considered competitive for decades.Both presidential candidates have intensified their campaigns in key swing states in the past few months.As voters cast their ballots, watching these regions will be key to determining the electoral college winner in 2024.