Final answer:
UNICEF does not publish background information on countries; it focuses on aid to children. The Economist's Intelligence Unit, CIA, and U.S. Department of Commerce provide detailed country data.
Step-by-step explanation:
The organization that does not publish background information on countries is UNICEF, which is the United Nations Children's Fund focused on providing humanitarian and developmental aid to children worldwide. The other entities listed, such as The Economist's Intelligence Unit, the Central Intelligence Agency, and the U.S. Department of Commerce, do provide various types of information and data about countries' economic environment, political environment, and geography. Specifically, the CIA World Factbook provides detailed information on the people, history, government, economy, energy, geography, communications, transportation, military, and transnational issues for entities around the world.