The election, which will take place in states from New Jersey, Virginia to California, is expected to mark a new turning point in an unprecedented political polarization since the civil rights movement of the 1960s.
If the Democrats win governorship races in Virginia and New Jersey while the Republican states continue to hold on to their red fortresses, the US political map will be further disjointed, analysts say. Each party has increasingly won only in places that belong to it and lost completely in the hands of its opponent.
But the bigger risk lies in the battle to redraw the election map. After Republican-controlled states such as Texas, Missouri and North Carolina abolished many of the Democratic lower house seats, the Democratic-controlled state of California is also preparing to pass Proposal 50 to eliminate up to five Republican seats. This race could see dozens of lawmakers of each party disappear from the hostly land, narrowing the chance of bipartisan representation in parliament.
When the political boundary is tightened, the two parties increasingly tend to "ignore the other half".
Professor Geoffrey Kabaservice, Niskanen Institute, commented: The two red and green blocks now have too few things in common. Being forced to live up to the other side's priorities becomes increasingly unacceptable."
To date, Trump has won 25 states in all three of his most recent elections - the highest number since Republican candidates Ronald Reagan and George H.W. Bush in the 1980s. But unlike before, when Democrats still held some Senate seats and governor's seats in conservative states, they have now almost completely disappeared from these 25 states.
The Republic now controls 22 of the 25 governor's seats and the entire state parliament there.
In contrast, in 19 green states, Democrats dominated the absolute - holding 17 state parliamentary sessions, almost all of the Senate seats and most of the governorship seats, except for a few exceptions such as New Hampshire, Vermont and Virginia. If party leader Abigail Spanberger wins the election, Democrats will strengthen control of 17/19 of these states.
One of the last fortresses to exist was the lower houses in the opponent's territory. In the red states, Democrats still hold about 43 seats, accounting for 23%, while Republicans hold 39 seats in the green states. But if the campaign for redistricting voting units continues to spread, this figure could fall to 1/3.
Efforts to map the elections in Texas, Florida, Missouri and Ohio - under pressure from Mr. Trump - are expected to erase dozens of Democratic representative areas. Conversely, if California and Virginia also counterattack, Republicans could lose dozens more seats in the green states.
According to researchers, the consequences are not only seat imbalances but also representative crises. In Trump's 25 states, up to 26.8 million voters will vote for Democrats in 2024 - and the same number in the opposite direction in the green states. However, their representatives are becoming fewer and fewer in parliament.
The ultimate consequence, according to Professor Eric Schickler (University of California, Berkeley), is that the next US presidents may only care about the states that have voted for them, rather than the whole country.
