Final answer:
Support for the death penalty in the U.S. has declined since the mid-1990s due to factors such as DNA evidence revealing wrongful executions and rulings from the Supreme Court.
Step-by-step explanation:
Support for the use of the death penalty in the U.S. has declined overall since the mid-1990s. In the 1970s, there were no executions, and since then, there has been a gradual shift against the death penalty. Factors such as DNA evidence revealing wrongful executions and several states abolishing capital punishment have contributed to this decline. The Supreme Court has also issued rulings narrowing the application of the death penalty. However, it is important to note that the trend may vary by state and region in the U.S.