Final answer:
The Supreme Court ruling that asserted that juveniles have the right to be convicted only if there is proof beyond a reasonable doubt is In re Winship.
Step-by-step explanation:
The Supreme Court ruling that asserted that juveniles have the right to be convicted only if there is proof beyond a reasonable doubt is In re Winship.
In this case, the Court held that the Due Process Clause of the Fourteenth Amendment requires the state to prove every element of a criminal offense beyond a reasonable doubt, including the guilt of the accused juvenile. This ruling ensures that juveniles are afforded the same level of protection as adults in criminal proceedings.