Although the definition of "country" may seem obvious, there are occupations of one country by another, stamp issued by areas in rebellion, reunifications, and regions that have issued their own stamps for one reason or another. A classic example is Germany; unified from many smaller entities, then divided into multiple zones of occupation at the end of World War II, then divided into West Germany and East Germany, then reunified. Catalogs typically treat West Germany as part of a single sequence under the name "Germany" while giving East German stamps their own numbers.