Formosa in the context of "Governor-General of Taiwan"

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.

Spanish Formosa (Spanish: Gobernación de Hermosa española) was a small colony of the Spanish Empire established in the northern tip of the island now known as Taiwan, then known to Europeans at the time as Formosa or to Spaniards as "Isla Hermosa" from 1626 to 1642. It was ceded to the Dutch Republic during the Eighty Years' War.

The Portuguese were the first Europeans to reach the island in 1544, and named it Formosa (Portuguese for "beautiful") due to the beautiful landscape as seen from the sea. The Spanish had translated the name into Spanish as "Hermosa" and is what was historically used in Spanish maps and documents about the colony.

Fort Zeelandia (Chinese: 熱蘭遮城; pinyin: Rèlánzhē Chéng; Pe̍h-ōe-jī: Ji̍at-lân-jia Siâⁿ) was a fortress built over ten years from 1624 to 1634 by the Dutch East India Company (VOC), in the town of Anping (now Anping District of Tainan) on Formosa, the former name of central island of Taiwan, during their 38-year rule over the western part of the island. The site had been renamed several times as Fort Orange (奧倫治城), Fort Anping (安平城) and Taiwan City (臺灣城) . The current name of the site in Chinese means Anping Old Fort (Chinese: 安平古堡; Pe̍h-ōe-jī: An-pêng Kó͘-pó).

During the seventeenth century, when Europeans from many countries sailed to Asia to develop trade, Formosa became one of East Asia's most important transit sites, and Fort Zeelandia an international business center. As trade at the time depended on "military force to control the markets", the value of Formosa to the Dutch was mainly in its strategic position. "From Formosa the Spanish commerce between Manila and China, and the Portuguese commerce between Macau and Japan could by constant attacks be made so precarious that much of it would be thrown into the hands of the Dutch, while the latter's dealings with China and Japan would be subject to no interruptions."

The first island chain is the first string of major Pacific archipelagos out from the East Asian continental mainland coast. It is principally composed of the Kuril Islands, the Japanese archipelago, the Ryukyu Islands, Taiwan (Formosa), the northern Philippines, and Borneo, hence extending all the way from the Kamchatka Peninsula in the northeast to the Malay Peninsula in the southwest. The first island chain forms one of three island chain doctrines within the island chain strategy in the U.S. foreign policy. It is considered a strategic military barrier to accessing the wider Pacific Ocean given the relative shallowness of waters to the west of the first island chain, which has important implications for submarine detection.

Much of the first island chain is roughly situated in waters claimed by the People's Republic of China (PRC). These include the South China Sea, within the disputed nine-dash line, as well as the East China Sea west of the Okinawa Trough.

The Asiatic-Pacific theater was the theater of operations of U.S. forces during World War II in the Pacific War during 1941–1945. From mid-1942 until the end of the war in 1945, two U.S. operational commands were in the Pacific. The Pacific Ocean Areas (POA), divided into the Central Pacific Area, the North Pacific Area and the South Pacific Area, were commanded by Fleet Admiral Chester W. Nimitz, Commander-in-Chief Pacific Ocean Areas. The South West Pacific Area (SWPA) was commanded by General of the Army Douglas MacArthur, Supreme Allied Commander South West Pacific Area. During 1945, the United States added the United States Strategic Air Forces in the Pacific, commanded by General Carl A. Spaatz.

Because of the complementary roles of the United States Army and the United States Navy in conducting war, the Pacific Theater had no single Allied or U.S. commander (comparable to General of the Army Dwight D. Eisenhower in the European Theater of Operations). No actual command existed; rather, the Asiatic-Pacific Theater was divided into SWPA, POA, and other forces and theaters, such as the China Burma India Theater.

The Chamic languages, also known as Aceh–Chamic and Acehnese–Chamic, are a group of ten languages spoken in Aceh (Sumatra, Indonesia) and in parts of Cambodia, Thailand, Vietnam and Hainan, China. The Chamic languages are a subgroup of Malayo-Polynesian languages in the Austronesian family. The ancestor of this subfamily, proto-Chamic, is associated with the Sa Huỳnh culture, its speakers arriving in what is now Vietnam from Formosa.

The most widely spoken Chamic languages are Acehnese with 3.5 million speakers, Cham with about 280,000, and Jarai with about 230,000, in both Cambodia and Vietnam. Tsat is the most northern and least spoken, with only 3000 speakers.