Mallory Swanson marked her 100th cap with the winning goal as the United States defeated Brazil 1-0 to win a record-extending fifth Olympic gold medal in women's football.
Two-time runners-up Brazil were seeking their first gold and thought they had taken the lead early on at the Parc des Princes, only for Ludmila's strike to be rightly ruled out for offside.
Swanson used her pace to break clear soon after but was unable to get the better of Lorena, with neither side truly going close to finding a breakthrough in the first half.
The Selecao suffered a blow early in the second period when Vitoria Yaya was forced off the field on a stretcher and their outing soon got worse when Swanson fired home.
Chicago Red Stars forward Swanson held her line well, latched on to Korbin Albert's throughball and calmly slotted past Lorena with 57 minutes on the clock in Paris.
Brazil could have taken a game of few clear-cut chances to extra-time, but an unmarked Adriana saw her header kept out by Alyssa Naeher in stoppage time as Emma Hayes' team claimed gold.
Data Debrief: Swanson the golden girl for USA
Swanson was denied a dramatic goal on her 99th cap for the USA in their 1-0 extra-time win over Mexico in the semis, but she marked her century in the perfect manner as she scored for the fourth time this tournament.
The 26-year-old is the 44th player in USWNT history to reach that milestone and is the youngest since Amy Rodriguez (25) did so in 2012.
The USA's fifth Olympic gold, coming 12 years after their last success in London, takes them four clear of Germany, Canada and Norway as comfortably the most successful side in the competition.
Caribbean representative Dominican Republic ended their Concacaf Women's Gold Cup campaign winless, as they went down 0-3 to Argentina, while Mexico stunned tournament favourites United States 2-0, in the final round of Group A fixtures at Dignity Health Sports Park in Carson, California, on Monday.
The results saw Mexico finishing tops in the group on seven points, with United States second on six, while Argentina improved their chances of being one of the two best third-place teams to progress to the quarterfinals, as they end third on four points. Dominican Republic finished without a point and conceded 16 goals.
Dominican Republic vs Argentina
With two third place spots up for grabs at that point, both Dominican Republic and Argentina started purposefully and with some intensity as they went in search of their first win. The fact that Argentina held Mexico to a goalless stalemate to start the tournament, while Dominican Republic lost 0-8 to the same opponent, meant the South Americans were a bit more confident, and they put that on display in the early exchanges.
They pushed back their Spanish-speaking Caribbean rivals into a defensive posture and fired a few warning shots from a distance, before they inevitably broke the deadlock in the 30th minute. Midfielder Dalila Ippolito fired home from a one-on-one situation with Dominican Republic's goalkeeper Paloma Pena, after the opponents defence failed to take care of possession.
Argentina doubled their lead in the second half through Celeste Dos Santos's 76th-minute effort, which polished off a tidy one-two combination with Mariana Larroquette.
And the win was capped by Maricel Pereyra in the 90+4, who fired home from just outside the 18-yard area.
United States vs Mexico
The feature contest of the group ended with Mexico securing a historic 2-0 win over four-time World champions United States to take top honours.
It is the first Mexico win against the United States since 2010, a span of 16 matches. The two goals also snap a streak of 33 straight matches in which the United States kept a clean sheet in Concacaf competitions.
Both teams gave as good as they got in end-to-end action, with strikers Sophia Smith of United States and Mexico's Maria Sanchez testing the goalkeepers Esthefanny Barreras and Alyssa Naeher, who both proved equal to the task.
Mexico eventually found the go-ahead goal in the 38th minute when Jaqueline Ovalle capitalized on a defensive error by Becky Sauerbrunn and fired past the hapless Naeher, who was left for dead after advancing off her line.
Karla Nieto went close to doubling the lead on the stroke of half time, but her well-struck shot from just outside the 18-yard box, rattled the crossbar.
United States went in search of the elusive equaliser, but their hunt ended fruitless, as Lindsey Horan fired a freekick over the crossbar in the 56th, while Trinity Rodman's 89th-minute effort went just wide of the upright.
And if that wasn't bad enough, Mayra Pelayo rubbed salt in the United States wounds in the 90+5, when she rifled home a right-footer from outside the box, that lodge in the top right corner, to gift Mexico an historic victory.
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