WASHINGTON (AP) — A divided America weighed a stark choice for the nation's future Tuesday as a presidential campaign marked by upheaval and rancor approached its finale.

Voters were deciding whether to send Republican Donald Trump back to the White House or elevate Vice President Kamala Harris to the Oval Office. As the first polls began to close in parts of Kentucky and Indiana, tens of millions of Americans added their ballots to the 84 million cast early as they chose between two candidates with drastically different temperaments and visions for the country.

The economy and immigration are the top issues facing the country, voters said, but the future of democracy was also a leading motivator for many Americans casting a ballot in Tuesday's presidential election. AP VoteCast, an expansive survey of more than 110,000 voters nationwide, found a country mired in negativity and desperate for change.

Those casting Election Day ballots mostly encountered a smooth process, with isolated reports of hiccups that regularly happen, including long lines, technical issues and ballot printing errors.

Harris stands to be the first female president if elected and has promised to work across the aisle to tackle economic worries and other issues without radically departing from the course set by President Joe Biden. Trump has vowed 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.

Harris and Trump entered Election Day focused on seven swing states, five of them carried by Trump in 2016 before they flipped to Biden in 2020: the "blue wall" 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.

Trump voted in Palm Beach, Florida, near his Mar-a-Lago club, and said afterward that he was feeling "very confident."

Harris, the Democratic vice president, did phone interviews with radio stations in the battleground states, then visited Democratic National Committee headquarters in Washington carrying a box of Doritos — her go-to snack.

"This truly represents the best of who we are," Harris told a room of cheering staffers. She was handed a cellphone by supporters doing phone banking, and when asked by reporters how she was feeling, the vice president held up a phone and responded, "Gotta talk to voters."

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.

Trump said Tuesday that he had no plans to tell his supporters not to refrain from violence if Harris wins, because they "are not violent people." Asked about accepting the race's results, he said, "If it's a fair election, I'd be the first one to acknowledge it." He visited a nearby campaign office to thank staffers before a party at a nearby convention center.

After her DNC stop, Harris planned to attend a party at her alma mater, Howard University in Washington.

Federal, state and local officials have expressed confidence in the integrity of the nation's election systems. They nonetheless were braced to contend with what they say is an unprecedented level of foreign disinformation — particularly from Russia and Iran — 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.

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 36 years.

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

In Scranton, Pennsylvania, Liza Fortt arrived at her polling location in a wheelchair and not feeling well. But she said she ventured out anyway to vote for Harris.

"It means a lot to me and my grandkids, my granddaughters, my nieces. ... I was just waiting for this day to come," said Fortt, who is 74 and Black. She said she never thought she'd have such an opportunity, to cast a ballot for a Black woman in a presidential race.

"I'm proud, to see a woman, not only a woman, but a Black woman," Fortt said.

Trump, 78, would be the oldest president 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.

He survived one assassination attempt by millimeters at a July rally. Secret Service agents foiled a second attempt in September.

A Trump victory would affirm that enough voters put aside warnings from many of Trump's former aides 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 after being found guilty 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 end the federal investigation into his effort to overturn the 2020 election results.

First-time voter Jasmine Perez, 26, cast her ballot at the Las Vegas Raiders' stadium in Nevada for Trump, citing his spiritual values.

"What really attracted me to Donald Trump is I'm a Christian," Perez said, noting of the former president, "I like that he openly promotes Christianity in America."

Harris, pointing to the warnings of Trump's former aides, has labeled him a "fascist" and blamed Trump for putting women's lives in danger by nominating three of the justices who overturned Roe v. Wade. In the closing hours of the campaign, she tried to strike a more positive tone and went all of Monday without saying her Republican opponent's name.

JD Jorgensen, an independent voter in Black Mountain, North Carolina, which was hit hard by Hurricane Helene, said voters should have made up their minds by now.

"I think that the candidates, both being in the public eye as long as they both have been, if you're on the fence, you hadn't really been paying attention," said Jorgensen, 35.

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