"in recent years, the supreme court has denied states the power to execute individuals who are"

Under the age of 17 and have mental disabilities.
   According to records the last of such deaths occurred in 2015. Although the Supreme court have passed their ruling for death by execution to stop but some states are still executing using this method which can be shooting, hanging, lethal injection and even gas chamber. However, congress have maintained that mentally incapacitated people and underaged should be excluded because it violates the 18th Amendment of the United States.

Iwould have to say c. the german americans.