Japan's occupation of Taiwan from 1895 to 1945 was the result of a long-standing expansionist strategy that traced back several centuries, culminating in the island’s colonization following the First Sino-Japanese War. This period of Japanese rule involved military suppression, political dominance, economic exploitation, and cultural assimilation, profoundly shaping Taiwan’s social and economic landscape.

The roots of Japan’s expansionist ambitions can be traced to the late 16th century under feudal lord Hideyoshi Toyotomi, who envisaged using the Korean Peninsula as a base to conquer China and extend Japanese influence across East Asia. Japan’s southward expansion began with the Ryukyu Islands in 1609, when the domain of Satsuma invaded and subordinated the Ryukyu Kingdom, which maintained tributary ties to China for nearly 300 years under Japanese dominance. The Meiji Restoration of 1868 further accelerated Japan’s military and political consolidation, leading to the formal annexation of the Ryukyus in 1879.

Japan’s interest in Taiwan intensified in the late 19th century. In 1874, a punitive expedition was launched against indigenous communities in Taiwan following an incident involving Ryukyuan fishermen, despite Japanese withdrawal under diplomatic pressure. This military action served multiple purposes, including testing Qing China’s defenses, asserting Japanese claims over Ryukyuan nationals, and providing a prelude for larger territorial ambitions.

The First Sino-Japanese War (1894-1895) culminated in the Treaty of Shimonoseki, under which China ceded Taiwan and the Penghu Islands to Japan. Japanese colonial rule over Taiwan lasted for half a century, during which the island's population endured harsh repression, including violent crackdowns on uprisings. Political rights such as voting or standing for election were denied to Taiwanese residents, and efforts to reshape the island’s cultural identity through assimilation policies were widespread. Taiwan’s governance operated under a police-controlled authoritarian regime directed by a governor-general. Additionally, during World War II, many Taiwanese were conscripted into the Japanese military.

Discussions surrounding Japan’s impact on Taiwan often reference the island’s modernization during the colonial period. However, historical assessments indicate that much of Taiwan's infrastructural and industrial development began prior to the occupation under the late Qing Dynasty, with improvements in transportation, communication, and mining already underway. Japanese colonial authorities largely exploited Taiwan’s natural and human resources for their own benefit. Land confiscations displaced local farmers, with over 70 percent of cultivable land eventually controlled by Japanese companies or individuals. Key industries, such as sugar production, were dominated by Japanese zaibatsus, and profits were transferred to Japan rather than reinvested locally.

Taiwan’s economy was integrated into Japan’s imperial system, with foreign trade almost entirely dependent on Japan and its territories by 1939. While some industrialization occurred, particularly to support Japan’s wartime economy after 1937, the industrial base remained uneven and controlled by Japanese capital. Taiwanese workers faced wage disparities and limited opportunities for advancement compared to their Japanese counterparts.

Prominent Chinese figures visiting Taiwan during this period documented the underlying hardships faced by its inhabitants. Philosopher Zhang Taiyan and reformer Liang Qichao highlighted heavy taxation, educational discrimination, and economic exploitation contrasting official Japanese narratives of progress. Liang’s reports emphasized the suppression of Chinese language and culture, the hardships of dispossessed farmers, and the economic impact of severed ties with the Chinese mainland. These firsthand accounts underscored the disconnect between Japan’s portrayed achievements and the lived realities of Taiwanese residents.

Following Japan’s defeat in World War II, Taiwan faced significant challenges including food shortages and unemployment, partly attributable to the structural deficiencies imposed during colonial rule. The legacy of this period remains contested, with suppression, exploitation, and cultural erasure features that complicate narratives of modernization.