The US Mint shipped 8.4 billion pennies for circulation in 2017, more than all nickels (1.3 billion), dimes (2.4 billion), and quarters (1.9 billion) combined.  While countries such as Australia, Canada, and New Zealand have phased out their one-cent pieces, Harris Poll found that 55% of Americans are in favor of keeping the penny and 29% want to abolish it. The US Mint produces coins as instructed by Congress, so a law would have to be passed by Congress and signed by the President in order for pennies to be removed from circulation.  Several unsuccessful legislative efforts have sought to bring about the penny's extinction. Most recently, in 2017, Senators John McCain (R-AZ) and Mike Enzi (R-WY) sponsored ultimately failed legislation that would have suspended minting of the penny. 
1,436 people were executed in the United States from 1977 through May 2016, primarily by means of lethal injection. Most death penalty cases involve the execution of murderers although capital punishment can also be applied for treason, espionage, and other crimes.