Designed by librarian Matthew White, this sprawling and somewhat idiosyncratic Website offers hundreds of political, economic, demographic, religious, and historical cartographies of the countries and continents of the last century. Visitors to this site can trace the global rise and fall of various political systems through the century, examine the mapped battle histories of the Mexican Revolution and the two world wars, compare the size and rate of growth of the world's largest cities, compare living conditions across time and countries, and much more. Some of the mappings seem questionable, such as placing the US in the category of "limited democracy" in the 1910s and "multi-party democracy" in the 1920s, but the author asserts that all cartographies are interpretive and that the maps here are drawn from scholarly sources of statistics or historical events, which he lists. Quite simply, there's too much fascinating information here graphically represented to quibble too much, though individuals using it for research or instruction will certainly want to double-check the authority of some of the claims.