 The city borders expanded on July 1, 1923, with the annexation of the neighbouring town of Yoshida and villages of Sarita, Miwa and Komaki.The city again expanded on April 1, 1954 by annexing neighbouring villages of Asahi, Furusato, Yanagihara, Wakatsuki, Asakawa, Naganuma, Amori, Odagiri, Imoi and Mamejima.In 1959, due to the flooding of Chikuma River, 71 people died or were missing and 20,000 homes were flooded.