For most of the time in which French served as an international lingua franca, it was not the native language of most Frenchmen: a report in 1794 conducted by Henri Grégoire found that of the country's 25 million people, only three million spoke French natively; the rest spoke one of the country's many regional languages, such as Alsatian, Breton or Occitan. Through the expansion of public education, in which French was the sole language of instruction, as well as other factors such as increased urbanisation and the rise of mass communication, French gradually came to be adopted by virtually the entire population, a process not completed until the 20th century.