In which case did the U.S.Supreme Court rule that the execution of offenders who were under the age of 18 when their crimes were committed could not be executed?

Question

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The U.S. Supreme Court ruled in Roper v. Simmons (2005) that executing offenders who were under the age of 18 at the time of their crimes violates the Eighth Amendment's prohibition against cruel and unusual punishment.

In Which Case Did the U