Also in 1939, Phibun changed the country's name from Siam to Prathet Thai, or Thailand, meaning "land of the free." This was a nationalist gesture: it implied the unity of all the Tai-speaking peoples, including the Lao and the Shan, but excluding the Chinese. The regime's slogan became "Thailand for the Thai."
Modernisation was also an important theme in Phibun's new Thai nationalism. From 1938 to 1942 he issued a set of 12 Cultural Mandates. In addition to requiring that all Thais salute the flag, know the National Anthem, and speak the national language, the mandates also encouraged Thais to work hard, stay informed on current events, and to dress in a western fashion. At the same time, Phibun worked rigorously to rid society of its royalist influences - traditional royal holidays were replaced with new national events, royal and aristocratic titles were abandoned. Ironically, he retained his aristocratic surname. Even the Sangha was affected when the status of the royally sponsored Thammayuth sect was downgraded.