Vovinam to demonstrate Vovinam publicly in Hanoi with his disciples in 1940, Nguyễn was invited to teach the art at Hanoi's Ecole Normale, and Vovinam gained in popularity. During the following years, political unrest increased throughout Vietnam; due to the system's nationalist political orientation, the art came under suppression. By 1954, Nguyễn had emigrated to South Vietnam, where he was able to continue to teach and establish Vovinam schools. After his death in 1960, Grandmaster Le Sang continued the development and international promotion of Vovinam until his own death on September 27, 2010. The first Vovinam school outside of Vietnam was
Martial law in Taiwan in April 1948. In December 1948, in the face of the mounting nationalists' defeats, Chiang Kai-shek announced the imposition of martial law throughout the country. However, remote areas such as Xinjiang, Tibet, Qinghai, as well as Taiwan Province are not within the scope of the influence. On 20 May 1949, Taiwan Province was officially included under the influence of the martial law. After the surrender of Japan in 1945, the ROC obtained control of Taiwan. In December 1949, the ROC government, led by President Chiang Kai-shek, retreated from Nanjing to Taipei, Taiwan's largest city. The ROC continued to claim sovereignty