Early settlement and Nan Madol The ancestors of the
Micronesians settled over four thousand years ago. A decentralized chieftain-based system eventually evolved into a more centralized economic and religious culture centered on
Yap Island.
Nan Madol, a
UNESCO World Heritage Site, consisting of a series of small
artificial islands linked by a network of canals, is often called the Venice of the Pacific. It is located on the eastern periphery of the island of Pohnpei and used to be the ceremonial and political seat of the
Saudeleur dynasty that united Pohnpei's estimated 25,000 people from about
AD 500 until 1500 when the centralized system collapsed. Following defeat in the
Spanish–American War, the Spanish sold the archipelago to
Germany in 1899 under the
German–Spanish Treaty of 1899. Germany incorporated it into
German New Guinea. (A few remote islands, notably
Kapingamarangi, were not specifically named in the treaty, but this remained unnoticed until the late 1940s and, while acknowledging the historical curiosity in 1949, Spain has made no modern claims to the islands.) During
World War I, it was captured by
Japan. Following the war, the
League of Nations awarded a
mandate for Japan to administer the islands as part of the
South Seas Mandate.
World War II and the aftermath Operation Hailstone Truk Lagoon served as a significant base for the
Imperial Japanese Navy during
World War II. In February 1944, the
U.S. Navy launched
Operation Hailstone, a massive air and surface attack on Truk Lagoon. Over two days, U.S. carrier aircraft and surface vessels targeted Japanese warships, merchant vessels, and shore installations, resulting in the sinking of numerous ships and the destruction of hundreds of aircraft. This operation severely diminished Japan's naval capabilities in the Pacific.
U.S. administration under the United Nations Following World War II, the islands of Micronesia were placed under the administration of the United States as part of the
Trust Territory of the Pacific Islands. This arrangement was formalized on 2 April 1947, with the adoption of
United Nations Security Council Resolution 21, which approved the terms of
trusteeship for the Pacific Islands formerly under Japanese mandate.
Path to independence On May 10, 1979, four of the Trust Territory districts
ratified a new
constitution to become the Federated States of Micronesia.
Palau, the
Marshall Islands, and the
Northern Mariana Islands chose not to participate. The FSM signed a
Compact of Free Association with the United States, which entered into force on November 3, 1986, marking Micronesia's emergence from trusteeship to independence. Independence was formally concluded under international law in 1990, when the United Nations officially ended the Trusteeship status pursuant to
Security Council Resolution 683. The Compact was renewed in 2004. In February 2021, due to a bitter leadership dispute, the Federated States of Micronesia announced it would quit the
Pacific Islands Forum in its formal process of withdrawal. However, in June 2022, the Suva Agreement was reached and the Federated States of Micronesia agreed to remain in the forum. ==Politics==