Penghu in the context of Taiwan (island)

The history of the island of Taiwan dates back tens of thousands of years to the earliest known evidence of human habitation. The sudden appearance of a culture based on agriculture around 3000 BC is believed to reflect the arrival of the ancestors of today's Taiwanese indigenous peoples. People from China gradually came into contact with Taiwan by the time of the Yuan dynasty (1271–1368) and Han Chinese people started settling there by the early 17th century. The island became known by the West when Portuguese explorers discovered it in the 16th century and named it Formosa. Between 1624 and 1662, the south of the island was colonized by the Dutch headquartered in Zeelandia in present-day Anping, Tainan whilst the Spanish built an outpost in the north, which lasted until 1642 when the Spanish fortress in Keelung was seized by the Dutch. These European settlements were followed by an influx of Hoklo and Hakka immigrants from Fujian and Guangdong.

In 1662, Koxinga defeated the Dutch and established a base of operations on the island. His descendants were defeated by the Qing dynasty in 1683 and their territory in Taiwan was annexed by the Qing dynasty. Over two centuries of Qing rule, Taiwan's population increased by over two million and became majority Han Chinese due to illegal cross-strait migrations from mainland China and encroachment on Taiwanese indigenous territory. Due to the continued expansion of Chinese settlements, Qing-governed territory eventually encompassed the entire western plains and the northeast. This process accelerated in the later stages of Qing rule when settler colonization of Taiwan was actively encouraged. The Qing ceded Taiwan and Penghu to Japan after losing the First Sino-Japanese War in 1895. Taiwan experienced industrial growth and became a productive rice- and sugar-exporting Japanese colony. During the Second Sino-Japanese War it served as a base for invasions of China, and later Southeast Asia and the Pacific during World War II.

Taiwan, officially the Republic of China (ROC), is a country in East Asia. The island of Taiwan, formerly known to Westerners as Formosa, has an area of 35,808 square kilometres (13,826 sq mi) and makes up 99% of the land under ROC control. It lies about 180 kilometres (112 mi) across the Taiwan Strait from the southeastern coast of the Mainland China. The East China Sea is to the north of the island, the Philippine Sea to its east, the Luzon Strait directly to its south, and the South China Sea to its southwest. The ROC also controls a number of smaller islands, including the Penghu archipelago in the Taiwan Strait, Kinmen and Matsu in Fuchien near the Mainland coast, as well as Pratas and Taiping in the South China Sea.

Geologically, the main island comprises a tilted fault block, characterized by the contrast between the eastern two-thirds, consisting mostly of five rugged mountain ranges running parallel to the east coast, and the flat to gently rolling plains of the western third, where the majority of the population resides. Several peaks exceed 3,500 m in height – the highest, Yu Shan at 3,952 m (12,966 ft), makes Taiwan the world's fourth-highest island. The tectonic boundary that formed these ranges remains active, and the island experiences many earthquakes, some of them highly destructive. There are also many active submarine volcanoes in the Taiwan Straits.

The Taiwan Area, also called the Taiwan Area of the Republic of China, the free area of the Republic of China, and the "Tai-Min Area (Taiwan and Fuchien)", is a term used to refer to the territories under the effective control of the Republic of China (ROC, commonly known as "Taiwan"). It has been in official use since the Additional Articles of the Constitution of the Republic of China took effect, ending temporary anti-communist provisions on 1 May 1991. The term is also used in the 1992 Cross-Strait Act.

The area currently under the definition consists of the island groups of Taiwan, Penghu, Kinmen, Matsu and some minor islands. The collective term "Tai-Peng-Kin-Ma" is literally equivalent except that it only refers to the geographical areas of Taiwan, Penghu, Kinmen and Matsu Area, to the exclusion of Wuqiu, Dongsha Island, and Taiping Island.

The Treaty of Shimonoseki (Japanese: 下関条約, Hepburn: Shimonoseki Jōyaku), also known as the Treaty of Maguan in China or the Treaty of Bakan (馬關條約, Bakan Jōyaku) in Japan, was signed in Shimonoseki, Japan, on April 17, 1895, between the Empire of Japan and the Qing dynasty. The treaty ended the First Sino-Japanese War, in which the Japanese decisively defeated the Chinese land and naval forces. The treaty was signed at the Shunpanrō [ja] hotel by Count Itō Hirobumi and Viscount Mutsu Munemitsu for Japan and Li Hongzhang and his son Li Jingfang on behalf of China.

The peace conference took place from March 20 to April 17, 1895, and the treaty followed and superseded the Sino-Japanese Friendship and Trade Treaty of 1871. It consisted of 11 articles which provided for the termination of China's tributary relations with Korea; required that China pay an indemnity of 200 million taels and cede Taiwan (Formosa), the Penghu (Pescadores) Islands, and the Liaodong Peninsula to Japan; and opened four cities (Shashi, Chongqing, Suzhou, and Hangzhou) to Japan as trading ports. However, due to the diplomatic Triple Intervention of Russia, Germany, and France just one week after the treaty was signed, the Japanese withdrew their claim to the Liaodong Peninsula in return for an additional war indemnity of 30 million taels from China.

The population of Taiwan is approximately 23.36 million as of April 2025.

Immigration of Han Chinese to the Penghu Islands started as early as the 13th century. The main island was inhabited by a diversity of Taiwanese indigenous peoples speaking Austronesian languages until Han settlement began in the early 17th century, around the time of the Ming–Qing transition, when workers were mainly imported from Minnan region to the colony of Dutch Formosa in the southwest of Taiwan. According to governmental statistics, in the early 21st century, 95% to 97% of Taiwan's population are Han Taiwanese, while about 2.3% are Taiwanese of Austronesian ethnicity. Half the population are followers of one or a mixture of 25 recognized religions.

The island of Taiwan, along with the Penghu Islands, became an annexed territory of the Empire of Japan in 1895, when the Qing dynasty ceded Fujian-Taiwan Province in the Treaty of Shimonoseki after the Japanese victory in the First Sino-Japanese War. After Japanese forces crushed the consequent Republic of Formosa resistance movement, Japan ruled Taiwan for 50 years. Its capital was located in Taihoku (Taipei), the seat of the Governor-General of Taiwan.

Taiwan was Japan's first colony and can be viewed as the first step in implementing their "Southern Expansion Doctrine" of the late 19th century. Japan, which aimed to turn Taiwan into a showpiece "model colony", made efforts to improve the island's economy, public works, industry, cultural Japanization (1937 to 1945), and support the necessities of Japanese military aggression in the Asia-Pacific. Japan established monopolies and by 1945, had taken over all sales of opium, salt, camphor, tobacco, alcohol, matches, weights and measures, and petroleum on the island. Most Taiwanese children did not attend schools established by Japan until primary education was made mandatory in 1943.

Taiwan Province (Chinese: 臺灣省; pinyin: Táiwān Shěng; Pe̍h-ōe-jī: Tâi-oân-séng; PFS: Thòi-vàn-sén or Thòi-vân-sén) is a de jure administrative division of the Republic of China (Taiwan). Provinces remain a titular division as a part of the Constitution of the Republic of China, but are no longer considered to have any administrative function practically.

Taiwan Province covers approximately 69% of the island of Taiwan, and comprises around 31% of the total population. The province initially covered the entire island of Taiwan (Formosa), Penghu (the Pescadores), Orchid Island, Green Island, Xiaoliuqiu Island, and their surrounding islands. Between 1967 and 2014, six special municipalities (Kaohsiung, New Taipei, Taichung, Tainan, Taipei and Taoyuan) were split off from the province, all in the most populous regions.

The Government of the Republic of China is the national authority whose actual-controlled territory consists of main island of Taiwan (Formosa), Penghu, Kinmen, Matsu, and other island groups, collectively known as Taiwan Area or Free Area. A unitary state, the ROC government, under the current constitutional amendments, is run by a de facto semi-presidential system, consists of the presidency and five branches (Yuan): the Executive Yuan, Legislative Yuan, Judicial Yuan, Examination Yuan, and Control Yuan. The president is the head of state, with the premier as the head of government, currently ruled by the Democratic Progressive Party (DPP) since 2016. Since the 2005 amendments of the Additional Articles of the Constitution, the Legislative Yuan has been the de facto unicameral parliamentary body of the country.

Originally established in 1912 in Nanjing, the Government of the Republic of China relocated several times before finally moving to Taipei, Taiwan, in 1949 because of its military losses in the Chinese Civil War. Up until the 1990s, the government has historically been dominated by the Kuomintang (KMT) under the one-party state Dang Guo authoritarian regime, before evolving into a multi-party democracy after martial law and the climate of White Terror gradually ended. This government was the internationally recognized official government of China until 1971 by the United Nations and until 1979 by the United States.

The political status of Taiwan is a longstanding geopolitical subject focusing on the sovereignty of the island of Taiwan and its associated islands. The issue has been in dispute since the alleged retrocession of Taiwan from the Empire of Japan to the Republic of China (ROC) in 1945, and the ROC government’s retreat from mainland China to Taiwan as the result of the Chinese Civil War in 1949. The Taiwan Area since then has become the major territorial base of the ROC. The Chinese Communist Party (CCP)-led People’s Republic of China (PRC), despite never having control of it, claims Taiwan as an inalienable province. The PRC's claim is based on the theory of state succession, who deems itself as the regime that replaced the pre-1949 ROC, and denies the existing sovereignty of the ROC in Taiwan under its one China principle.

The ROC governed mainland China from 1912 until 1949, when it lost control of the mainland due to its defeat in the Chinese Civil War by the CCP, who established the PRC that same year, while the effective jurisdiction of the ROC has been limited to Taiwan and its associated islands. Prior to this, Japan’s surrender in 1945 ended its colonial rule over Taiwan and the Penghu Islands, which were subsequently placed under the administration of the ROC as agreed by the major Allies of World War II. However, post-war agreements did not clearly define sovereignty over these islands due to the ongoing rivalry between the Kuomintang (KMT) and the CCP. The division led to the emergence of two rival governments on opposite sides of the Taiwan Strait, each claiming to be the sole legitimate authority over both the Chinese mainland and Taiwan. The PRC and historically the ROC both officially adhere to the principle of "one China," but fundamentally disagree on who is entitled to represent it. This has resulted in what is known as the "Two Chinas" scenario, reflecting the unresolved dispute over which government is the legitimate representative of China.

The Republic of China Army (Chinese: 中華民國陸軍; pinyin: Zhōnghuá Mínguó Lùjūn) also known as the ROC Army (ROCA); colloquially the Taiwanese Army (Chinese: 台灣陸軍; pinyin: Táiwān lùjūn) by western or mainland Chinese media, or commonly referred as the National Military’s Army (Chinese: 國軍陸軍; pinyin: Guó jūn lùjūn) by local Taiwanese people, is the largest branch of Taiwan's military, the Republic of China Armed Forces.

An estimated 80% of the ROCA is based on the Main Island of Taiwan, while the remainder are stationed on the Penghu, Kinmen, Matsu, Dongsha, and Taiping Islands. This branch was also referred to historically as the Chinese Army and the Nationalist Chinese Army during and after World War II and the 1949 retreat.

Martial law in Taiwan (Chinese: 戒嚴時期; pinyin: Jièyán Shíqí; Pe̍h-ōe-jī: Kài-giâm sî-kî) refers to the periods in the history of Taiwan after World War II, during control by the Republic of China Armed Forces of the Kuomintang-led regime. The term is specifically used to refer to the over 38-year-long consecutive martial law period between 20 May 1949 and 14 July 1987, which was qualified as "the longest imposition of martial law by a regime anywhere in the world" at that time (having since been surpassed by Brunei).

With the outbreak of Chinese Civil War, the "Declaration of Martial Law in Taiwan Province" (臺灣省戒嚴令; Táiwān Shěng Jièyán Lìng; Tâi-oân-séng Kài-giâm Lēng) was enacted by Chen Cheng, who served as the chairman of Taiwan Provincial Government and commander of Taiwan Garrison Command, on 19 May 1949. This order was effective within the territory of Taiwan Province (including Island of Taiwan and Penghu). The provincial martial law order was then superseded by an amendment of the "Declaration of Nationwide Martial Law", which was enacted by the central government after the amendment received a retroactive consent by the Legislative Yuan on 14 March 1950. Martial law in Taiwan Area (including Island of Taiwan, Penghu) was lifted by a Presidential order promulgated by President Chiang Ching-kuo on 15 July 1987.

The president of the Republic of China, also known as the president of Taiwan, is the head of state of the Republic of China (Taiwan), as well as the commander-in-chief of the Republic of China Armed Forces. Before 1949 the position had the authority of ruling over Mainland China, but losing control of it after communist victory in the Chinese Civil War, the remaining jurisdictions of the ROC have been limited to Taiwan, Penghu, Kinmen, Matsu, and smaller islands.

Originally elected by the National Assembly, the presidency was intended to be a ceremonial office with no real executive power because the ROC was originally envisioned as a parliamentary republic. Since the 1996 election however, the president has been directly elected by plurality voting to a four-year term, with incumbents limited to serving two terms. The current president is Lai Ching-te of the Democratic Progressive Party, preceded by Tsai Ing-wen from the same party.

Magong (POJ: Má-keng) is a county-administered city and seat of Penghu County, Taiwan. Magong City is located on Penghu's main island.