1> China
2> Iran
3> United States of America
4> Vietnam
Wonderful company, eh?!
The United States also was recently criticized by Amnesty International for violations of international law, which prohibits the use of the death penalty against people under the age of 18.
The only countries in the world who have executed juveniles in the last decade are the Democratic Republic of Congo, Iran, Nigeria, Pakistan, Saudi Arabia, Yemen -- and the United States.