
| Japanese era | Christian era | Events in Tendo | Events in Japan | 
| Taisho era | 1920 | Establishment of the Tendo practical course girls' school (existing: Tendo senior high school). | 1914 / Start of the first World War. 1918 / Rice riot happens. 1922 / The Japanese Communist Party is formed illegally. 1925 / The promulgation of universal suffrage law | 
| 1925 | Peasant movements thrives, disputes between landowners and tenant farmers burst out. | ||
| Showa era | 1930 | Odajima incident happens. | 1931 / Manchurian Incident happens 1937 / Japan-China War happens 1941 / Japan declares war against America and Britain, and the Pacific Wars begin 1945 / Atomic bombs are dropped on Hiroshima and Nagasaki 1945 / Japan accepts Potsdam Declaration, and war is over 1951 / They have a peace conference in San Francisco and recognize Japanese independence 1960 / Japan sign a new U.S.-Japan security treaty. 1972 / Okinawa returns to Japan. 1972 / Japan restore diplomatic relations with China. | 
| 1941 | Elementary schools and junior high schools in Tendo become national elementary schools. | ||
| 1945 | Jimmachi with Yamagata Airport receives an air raid. | ||
| 1947 | National schools become elementary schools, and the "6-3-3 system" starts, 6 years of elementary school, 3 years of junior high school and 3 years of high sechools. | ||
| 1954 | 1 town and 6 villages merge and new Tendo city starts. (October 1, 1954) | ||
| 1958 | Municipal organization is enforced in the tenth in Yamagata. (October 1, 1958) | ||
| 1962 | Toyosaka village merges to Tendo city. (October 20, 1962) # Toyosaka village: current Takadama area, Hoshinuno area and Araya area | ||
| 1964 | All the cities are designated in a city planning area, and a preparation enterprise of a field is begun. (March 9, 1964) | ||
| 1967 | As a local autonomy excellent city, Tendo receive Minister for Home Affairs commendation. (November 17, 1967) | ||
| 1968 | Inauguration of whole line of Yamagata bypass (new Route 13). (December 18, 1968) | ||
| 1969 | They integrate junior high schools which there are in each area of Tendo and establish the Daiichi(first) junior high school and the Daini(2nd) junior high school. (April 1, 1969) | ||
| 1970 | They integrate junior high schools which there are in each area of Tendo and establish the Daisan(3rd) junior high school. (April 1, 1970) | ||
| 1972 | 15th anniversary of municipal organization enforcement. A current Government building is completed in Oinomori. (September 30, 1972) | ||
| 1974 | Establishment of a charter of Tendo. (October 1, 1974) | ||
| Establishment of a song of Tendo. (December 1, 1974) | |||
| 1976 | They decide a Red leaves as a tree of Tendo, an azalea of the flower of Tendo and a bunting as a bird of a city. (May 1, 1976) | ||
| 1977 | Population of a city exceeds 50,000 people. (May 11, 1977) | ||
| Tendo receives Minister for Home Affairs commendation at the 30th anniversary of local autonomy. (October 6, 1977) | |||
| 1983 | We will have the National Athletic Meet in Tendo in future, and they start to purchase a site. | ||
| 1986 | Public information magazine wins the Prime Minister prize. (October 21, 1986) | ||
| Open of the old county museum. (November 1, 1986) | |||
| 1987 | Nishi-Numata remains are designated on a historic spot of a country (January 26, 1987) | ||
| 1987 | 30th Anniversary of municipal organization enforcement. They are buried time capsules in each elementary school of the city. They develop land for a forest of shogi to Mt. Maizuru. (October 1, 1987) | 
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