Mr Blake was left paralysed from the waist down after being shot several times in the back as he got into a car where his three children were sitting.
The shooting of Mr Blake, a black man, by white policeman Rusten Sheskey on 23 August aggravated racial tensions.
Two people died and one was injured in another shooting in Kenosha days later.
Kyle Rittenhouse, now 18, denied six charges including first-degree reckless homicide over those shootings when he appeared at a virtual arraignment with his lawyer, Mark Richards, on Tuesday.
He was among many armed civilians who descended on the city in answer to calls from right-wing militia after Jacob Blake was shot.
Why were police not charged?
Kenosha County District Attorney Michael Graveley announced that no criminal charges would be brought against Officer Sheskey.
The shooting was captured on video by a bystander.
The district attorney said he “would have to disprove the clear expression of these officers that they had to fire a weapon to defend themselves”.
“I do not believe the state… would be able to prove that the privilege of self-defence is not available,” he said, quoted by the Associated Press.
Mr Graveley added that he had informed Mr Blake of the news before announcing his decision publicly.
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