From the Sino-Japanese War ending in 1895 to World War 2 ending in 1945, Taiwan was a Japanese colony. The reason many Taiwanese elders are able to speak Japanese is due to the colonization is due to this Japanese influence.
Japanese Colonization

First Sino-Japanese War and the Republic of Formosa
First Sino-Japanese War The Sino-Japanese War was fought from 1894-1895 between the Qing Dynasty of China and the Japanese Empire over the control of Korea. Since Korea was the entrance and exit for Japan into the continent, gaining control over Korea was extremely important. Japan invaded Korea, which prompted a response from Qing Dynasty. However,…
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The Wansei of Taiwan: History’s Castaways
Who are the Wansei? The term “Wansei” refers to the group of Japanese who were born in Taiwan during the era of Japanese imperial rule in Taiwan, including those born to Japanese-Taiwanese couples, and Taiwanese who left for Japan to study and remained there. Background After the First Sino-Japanese War ended in 1895, the Treaty…