The punishment that leads to death penalty is commonly referred to as capital punishment, which is a lawful infliction of death as a punishment. In the United States, various states employ this principle of death penalty. The sentence of death can be carried out with the help of lethal injection, electrocution, hanging, gas chamber, and firing squad. Relatively unquestioned for most of U.S. history, capital punishment emerged in the 1950s as a controversial subject. Since then, there have been legal, intellectual, and political debates over its use, with an increasing polarization of the public over the issue ...