WASHINGTON (AP) 鈥 A presidential campaign marked by upheaval and rancor approached its finale on Election Day as Americans decided whether to send Donald Trump back to the White House or elevate Kamala Harris to the Oval Office.

Polls opened across the nation Tuesday morning as voters faced a stark choice between two candidates who have offered drastically different temperaments and visions for the world鈥檚 largest economy and dominant military power. Millions of Americans had already cast their ballots, voting by mail and early in-person voting.

, the Democratic vice president, stands to be the first female president if elected. She to work across the aisle to tackle economic worries and other issues without radically departing from the course set by President Joe Biden. , the Republican former president, to replace thousands of federal workers with loyalists, impose sweeping tariffs on allies and foes alike, and stage the largest deportation operation in U.S. history.

The two candidates spent the overlapping in Pennsylvania, the biggest battleground state. They were trying to energize their bases as well as Americans still on the fence or debating whether to vote at all.

"It鈥檚 important, it鈥檚 my civic duty and it鈥檚 important that I vote for myself and I vote for the democracy and the country which I supported for 22 years of my life,鈥 said Ron Kessler, 54, an Air Force veteran from Pennsylvania who said he was voting for just the second time.

Harris and Trump entered Election Day focused on seven battleground states, five of them carried by Trump in 2016 before flipping to Biden in 2020: the 鈥渂lue wall鈥 of Pennsylvania, Michigan and Wisconsin as well as Arizona and Georgia. Nevada and North Carolina, which Democrats and Republicans respectively carried in the last two elections, also were closely contested.

The closeness of the race and the number of states in play raised the likelihood that once again a victor might not be known on election night. There was one early harbinger from the New Hampshire hamlet of Dixville Notch, which by tradition votes after midnight on Election Day. Dixville Notch split between Trump and Harris, with three votes for each.

In the 2020 presidential race it took four days to declare a winner. Regardless, Trump has baselessly claimed that if he lost, it would be due to fraud. Harris' campaign was preparing for him to before a winner is known on Tuesday night or to try to contest the result if she wins. Four years ago, Trump to overturn the voters鈥 will that at the U.S. Capitol.

Trump planned to vote in his adopted home state of Florida on Tuesday, then spend the day at his Mar-a-Lago estate in advance of a party at a nearby convention center. Harris already voted by mail in her home state of California. She'll have a watch party at her alma mater, Howard University in Washington.

Each candidate would take the country into new terrain

Harris, 60, would be the first woman, Black woman and person of South Asian descent to serve as president. She also would be the first sitting vice president to win the White House in 32 years.

A victory would cap a whirlwind campaign unlike any other in American history. Harris less than four months ago after Biden, facing massive pressure from his party after a disastrous debate performance, ended his reelection bid.

Trump, 78, would be the ever elected. He would also be the first defeated president in 132 years to win another term in the White House, and the first person convicted of a felony to take over the Oval Office.

Having by some allies after Jan. 6, Trump in the Republican primary and consolidated the support of longtime allies and harsh critics within his party. He by millimeters at a July rally. Secret Service agents in September.

A victory for Trump would affirm that enough voters put aside or instead prioritized concerns about Biden and Harris' stewardship of the economy or the U.S.-Mexico border.

It would all but ensure he avoids going to prison of his role in hiding hush-money payments to an adult film actress during his first run for president in 2016. His sentencing in that case could occur later this month. And upon taking office, Trump could into his effort to overturn the 2020 election results.

The election has huge stakes for America and the world

The potential turbulence of a second Trump term has been magnified by his embrace of the Republican Party鈥檚 far right and his disregard for long-held democratic norms.

Trump has used and other Democrats, calling them 鈥渄emonic,鈥 and has against 鈥渆nemies from within.鈥

Harris, pointing to the warnings of Trump's former aides, a 鈥渇ascist鈥 and blamed Trump for putting women's lives in danger by who overturned Roe v. Wade. In the closing hours of the campaign, she tried to strike a more positive tone and went the entire last day Monday without saying her Republican opponent's name.

Heading into Election Day, federal, state and local officials of the nation鈥檚 election systems. They nonetheless were braced to contend with what they say is an unprecedented level of foreign disinformation 鈥 particularly from Russia and Iran 鈥 as well as the possibility of physical violence or cyberattacks.

Both sides have armies of lawyers in anticipation of legal challenges on and after Election Day. And law enforcement agencies nationwide are on high alert for potential violence.

The outcome of the race was being closely watched around the world, with the future of American support for Ukraine, U.S. fidelity to its global alliances and the nation鈥檚 commitment to stand up to autocrats hanging in the balance.

Harris has Kyiv's defense against Russia's full-scale 2022 invasion. Trump has Ukraine, Russian President Vladimir Putin and suggested he of the U.S. that Trump considers delinquent.

Voters nationwide also were deciding thousands of other races that will decide everything from control of Congress to state ballot measures on abortion access.

More than 82 million 鈥 shy of the record set during the 2020 pandemic, when Trump encouraged Republicans to stick to voting on Election Day. This time, he urged his voters to lock down their ballots in advance and they complied in droves.

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Associated Press writers Jill Colvin in Palm Beach, Florida, Darlene Superville and Eric Tucker in Washington, and Marc Levy in Allentown, Pennsylvania, contributed to this report.

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