Germans are the natives or inhabitants of Germany, or sometimes more broadly any people who are of German descent or native speakers of the German language. The constitution of Germany, implemented in 1949 following the end of World War II, defines a German as a German citizen. During the 19th and much of the 20th century, discussions on German identity were dominated by concepts of a common language, culture, descent, and history. Today, the German language is widely seen as the primary, though not exclusive, criterion of German identity. Estimates on the total number of Germans in the world range from 100 to 150 million, most of whom live in Germany.