2000: This was the second closest presidential election (1960 was the the closest) in the nation's history, with a .009% margin, 537 votes, separating the two candidates in the decisive state, Florida. The narrow margin there triggered a mandatory machine recount the next day, after which Gore requested hand recounts in four counties, including three in populous South Florida, as permitted by law. Litigation ensued in numerous counties in both state and federal courts, ultimately reaching the Florida Supreme Court and the United States Supreme Court.
The high court's contentious 5–4 decision in Bush v. Gore, announced on December 12, 2000, ended a statewide recount ordered by the Florida Supreme Court on December 8, effectively awarding Florida's votes to Bush and granting him the victory. According to Lance deHaven-Smith of Florida State University, based on "the definitive study of the uncounted ballots" (the Florida Ballot Project by NORC at the University of Chicago), if all the legally valid votes in Florida had been counted statewide,
Gore would have been the winner."
https://en.wikipedia.org/wiki/United_States_presidential_election,_2000
2004: Ohio made the difference between a win for Kerry and a win for Bush. "A review of the available data reveals that in Ohio alone, at least 357,000 voters, the overwhelming majority of them Democratic, were prevented from casting ballots or did not have their votes counted in 2004 -- more than enough to shift the results of an election decided by 118,601 votes. In what may be the single most astounding fact from the election, one in every four Ohio citizens who registered to vote in 2004 showed up at the polls only to discover that they were not listed on the rolls, thanks to GOP efforts to stem the unprecedented flood of Democrats eager to cast ballots.
And that doesn't even take into account the troubling evidence of outright fraud, which indicates that upwards of 80,000 votes for Kerry were counted instead for Bush. That alone is a swing of more than 160,000 votes -- enough to have put John Kerry in the White House.
https://www.commondreams.org/views06/0601-34.htm
2016: Clinton received about 2.9 million more votes nationwide, a margin of 2.1%. On January 6, 2017, the United States government's intelligence agencies concluded that the Russian government interfered in the 2016 United States elections. By the time we know exactly what happened in this election Trump will have finished serving his term. But I don't have any doubt that there was enough interference to swing the election to Trump. When all the evidence is in, it will be overwhelming.
= new reply since forum marked as read