Rittenhouse, 18, began to choke up, fell forward toward the defense table and then hugged one of his attorneys as he heard a court clerk recite "not guilty" five times. A sheriff's deputy immediately whisked him out a back door.
"He wants to get on with his life," defense attorney Mark Richards said. "He has a huge sense of relief for what the jury did to him today. He wishes none of this ever happened. But as he said when he testified, he did not start this."
The verdict in the politically combustible case was met with anger and disappointment from those who saw Rittenhouse as a vigilante and a wannabe cop, and relief and vindication from those who regarded him as a patriot who wanted to stop lawlessness and exercised his Second Amendment right to carry a gun and to defend himself.
WATCH: The verdict is read:
The Rev. Jesse Jackson, the longtime civil rights leader, the verdict throws into doubt the safety of people who protest in support of Black Americans.
"It seems to me that it's open season on human rights demonstrators," he said.
Rittenhouse was charged with homicide, attempted homicide and reckless endangering for killing two men and wounding a third with an AR-style semi-automatic rifle in the summer of 2020 during a tumultuous night of protests over the shooting of a Black man, Jacob Blake, by a white Kenosha police officer.
The former police youth cadet said he went to Kenosha to protect property from rioters. He is white, as were those he shot.
The anonymous jury, whose racial makeup was not disclosed by the court but appeared to be overwhelmingly white, deliberated for close to 3 1/2 days.
President Joe Biden called for calm, saying that while the outcome of the case "will leave many Americans feeling angry and concerned, myself included, we must acknowledge that the jury has spoken."
Rittenhouse could have gotten life in prison if found guilty on the most serious charge, first-degree intentional homicide, or what some other states call first-degree murder. Two other charges each carried over 60 years behind bars.
WATCH: Jacob Blake family reacts to verdict:
Kenosha County District Attorney Michael Graveley said his office respects the jury's decision, and he asked the public to "accept the verdicts peacefully and not resort to violence."
Ahead of the verdict, Democratic Gov. Tony Evers announced last week that 500 National Guard members stood ready in case of trouble after the verdict.
As he dismissed the jurors who sat in judgment in the politically combustible case, Circuit Judge Bruce Schroeder assured them the court would take "every measure" to keep them safe.
Wisconsin Lt. Gov. Mandela Barnes, who is Black and a Democratic candidate for U.S. Senate, denounced the outcome. He, like many civil rights activists, saw a racial double standard at work in the case.
"Over the last few weeks, many dreaded the outcome we just witnessed," Barnes said. "The presumption of innocence until proven guilty is what we should expect from our judicial system, but that standard is not always applied equally. We have seen so many black and brown youth killed, only to be put on trial posthumously, while the innocence of Kyle Rittenhouse was virtually demanded by the judge."
Political figures on the right, meanwhile, welcomed the verdict and condemned the case brought against Rittenhouse.
"All of us who knew what actually happened in Kenosha last year assumed this would be the verdict," tweeted Republican former Wisconsin Gov. Scott Walker. "Thankfully, the jury thought the same."
The case was part of an extraordinary confluence of trials that reflected the deep divide over race in the United States: In Georgia, three white men are on trial in the killing of Ahmaud Arbery, while in Virginia, a trial is underway in a lawsuit over the deadly white-supremacist rally held in Charlottesville in 2017.
WATCH: Full ABC News special report on verdict:
The bloodshed in Kenosha took place during a summer of sometimes-violent protests set off across the U.S. by the killing of George Floyd in Minneapolis and other cases involving the police use of force against Black people.
Rittenhouse was 17 when he went to Kenosha from his home in nearby Antioch, Illinois, after businesses were ransacked and burned in the nights that followed Blake's shooting. Rittenhouse carried a weapon authorities said was illegally purchased for the underage young man, joining other armed civilians on the streets.
Bystander and drone video captured most of the frenzied chain of events that followed: Rittenhouse killed Joseph Rosenbaum, 36, then shot to death protester Anthony Huber, 26, and wounded demonstrator Gaige Grosskreutz, now 28.
Then-President Donald Trump said it appeared Rittenhouse had been "very violently attacked." Supporters donated more than $2 million toward his legal defense.
At trial, prosecutors portrayed Rittenhouse as a "wannabe soldier" who had gone looking for trouble that night and was responsible for creating a dangerous situation in the first place by pointing his rifle at demonstrators.
But Rittenhouse testified: "I didn't do anything wrong. I defended myself."
Breaking into sobs at one point, he told the jury he opened fire after Rosenbaum chased him and made a grab for his gun. He said he was afraid his rifle was going to be wrested away and used to kill him.
Huber was then killed after hitting Rittenhouse in the head or neck with a skateboard, and Grosskreutz was shot after pointing a gun of his own at Rittenhouse.
After the verdict, Huber's parents, Karen Bloom and John Huber, said the outcome "sends the unacceptable message that armed civilians can show up in any town, incite violence, and then use the danger they have created to justify shooting people in the street."
Rittenhouse's mother, Wendy Rittenhouse, seated near her son on a courtroom bench, gasped in delight, cried and hugged others around her.
Richards, the defense attorney, said Rittenhouse wants to be a nurse and is in counseling for post traumatic stress disorder and will probably move away because "it's too dangerous" for him to continue to live in the area.
Video and testimony from some of the prosecution's own witnesses seemed to buttress Rittenhouse's claim of self-defense.
Witnesses described Rosenbaum as "hyperaggressive" and said that he dared others to shoot him and threatened to kill Rittenhouse earlier that night. A videographer testified Rosenbaum lunged for the rifle just before he was shot, and a pathologist said his injuries appeared to indicate his hand was over the barrel.
Also, Rosenbaum's fiancee disclosed that he was on medication for bipolar disorder and depression. Rittenhouse's lawyers branded Rosenbaum a "crazy person."
Some civil rights activists saw glaring disparities in the way the white gunman was treated.
On the night of the shootings, law enforcement officers saw Rittenhouse and other armed people on the streets despite a curfew and gave them bottles of water, with one officer heard saying over a loudspeaker, "We appreciate you guys."
Later, amid the tumult, Rittenhouse managed to get past a police line with his weapon slung over his shoulder and was not arrested that night. He turned himself in the next day.
Rittenhouse had also been charged with possession of a dangerous weapon by a person under 18, a misdemeanor that carries nine months behind bars and appeared likely to lead to a conviction.
But the judge threw out that charge before jury deliberations after the defense argued that the Wisconsin law did not apply to the long-barreled rifle used by Rittenhouse.