CIA World Factbook is published by the Central Intelligence Agency and contains information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues 267 countries. According to their website, their reference tabs include: maps of the major world regions, Flags of the World, a Physical Map of the World, a Political Map of the World, a World Oceans map, and a Standard Time Zones of the World map.
Background Notes is published by the State Department include facts about the land, people, history, government, political conditions, economy, and foreign relations of independent states, some dependencies, and areas of special sovereignty.
Country Studies Series by the Library of Congress presents a description and analysis of the historical setting and the social, economic, political, and national security systems and institutions of countries throughout the world. You can search our catalog to view these online. Search: "country study" AND Mexico (or other country of interest). Select the title with the location "Internet" and you can view the information online. *** Note: Check the publication date for the country study. The specific information on the current heads of state may be outdated, but the historical, contextual information can still be relevant.
The Latin American Network Information Center (LANIC) is affiliated with the Lozano Long Institute of Latin American Studies at the University of Texas at Austin. LANIC's mission is to facilitate access to Internet-based information to, from, or on Latin America.