Despite modernization of the Japanese school system after 1872, this period was marked by the war in East Asia and nationalism focusing on the emperor, whereby the imperial rescript of 1890 defined the core of national education. Following defeat in the Second World War, Japan reformed its education system in accordance with a policy geared towards peace and democracy in line with the United Nations. However, following the peace treaty of 1951 and renewed economic development during the Cold War, the conservative power bloc revised history textbooks in accordance with nationalist ideology. Many teachers, historians and trade unions resisted this tendency, and in 1982 neighboring countries in East Asia protested against the Japanese government for justifying past aggression in history textbooks. As a result, descriptions of wartime misdeeds committed by the Japanese army found their way into textbooks after 1997. Although the ethnocentric history textbook for Japanese secondary schools was published and passed government screening in 2001, there is now a trend towards bilateral or multilateral teaching materials between Japan, South Korea, and China. Two bilateral and one multilateral work have been published so far, which constitute the basis for future trials toward publishing a common textbook.