Final answer:
The Supreme Court ruling that juveniles do not have the right to jury trials because not all rights are constitutionally assured for juveniles is false.
Step-by-step explanation:
The statement is False. While the Supreme Court has ruled on several cases related to the rights of juveniles, the ruling mentioned in the question is not accurate. The Supreme Court has recognized that juveniles have some constitutional rights, and their rights may be limited or modified due to their status as minors.
However, juveniles still have basic due process rights, including the right to a fair trial and legal representation.