Buddhism in Japan began teaching devotion to the "Lotus Sutra". Eventually, his disciples formed their own school of Nichiren Buddhism, which includes various sects that have their own interpretations of Nichiren's teachings. Nichiren Buddhism established the foundation of Japanese Buddhism in the thirteenth century. The school is known for its sociopolitical activism and looks to reform society through faith. In the Muromachi period, Zen, particularly the Rinzai school, obtained the help of the Ashikaga shogunate and the Emperor of Japan, and accomplished considerable development. After the Sengoku period of war, Japan was re-united in the Azuchi–Momoyama period. This decreased the power of Buddhism,
Pure Land Buddhism Pure Land Buddhism as an independent sect in Japan known as Jōdo-shū. Today Pure Land is an important form of Buddhism in Japan, China, Korea, and Vietnam. Pure Land schools make up almost 40 percent of Japanese Buddhism practitioners with the most temples, second to Chan schools. These schools were influenced by the thought that humans could no longer understand the dharma by themselves. Contemporary Pure Land traditions see Amitābha expounding the Dharma in his buddha-field (Skt. "buddhakṣetra"), or "pure land", a region offering respite from karmic transmigration. Amitābha's pure land of Sukhāvatī is described in the "Longer Sukhāvatīvyūha Sūtra"