The Marshall Islands, officially the Republic of the Marshall Islands (Marshallese: Aolepān Aorōkin M̧ajeļ), is an island country located near the equator in the Pacific Ocean, slightly west of the International Date Line. Geographically, the country is part of the larger island group of Micronesia. The country's population of 53,158 people (at the 2011 Census) is spread out over 29 coral atolls, comprising 1,156 individual islands and islets.
The islands share maritime boundaries with the Federated States of Micronesia to the west, Wake Island to the north, Kiribati to the southeast, and Nauru to the south. About 27,797 of the islanders (at the 2011 Census) live on Majuro, which contains the capital. Data from the United Nations indicates an estimated population in 2017 of 53,134. In 2016, 73.3% of the population were defined as being "urban". The UN also indicates a population density of 295 per Km2 (765 people per mi2) and its estimated 2020 population is 53,263.
Micronesian colonists reached the Marshall Islands using canoes circa 2nd millennium BC, with inter-island navigation made possible using traditional stick charts. They eventually settled here. Islands in the archipelago were first explored by Europeans in the 1520s, starting with Ferdinand Magellan of Portugal and Miguel de Saavedra of Spain. Spanish explorer Alonso de Salazar reported sighting an atoll in August 1526. Other expeditions by Spanish and English ships followed. The islands derive their name from British explorer John Marshall, who visited in 1788. The islands were historically known by the inhabitants as "jolet jen Anij" (Gifts from God).
Spain claimed the islands in 1592 and the European powers recognized its sovereignty over the islands in 1874. They had been part of the Spanish East Indies formally since 1528. Later, Spain sold the islands to the German Empire in 1885, and they became part of German New Guinea that year, run by the trading companies doing business in the islands, particularly the Jaluit Company. In World War I the Empire of Japan occupied the Marshall Islands, which in 1920, the League of Nations combined with other former German territories to form the South Pacific Mandate. During World War II, the United States conquered the islands in the Gilbert and Marshall Islands campaign in 1944. Nuclear testing began in 1946 on Bikini Atoll after residents were evacuated. Over the years, 67 weapon tests were conducted, including the 15-megatonne Bravo hydrogen bomb test that created significant fallout in the region. The testing concluded in 1958. Over the years, some cleanup was completed by the US government.
The US government formed the Congress of Micronesia in 1965, a plan for increased self-governance of Pacific islands. The Trust Territory of the Pacific Islands in 1979 provided independence to the Marshall Islands, whose constitution and president (Amata Kabua) were formally recognized by the US. Full sovereignty or Self-government was achieved in a Compact of Free Association with the United States. Marshall Islands has been a United Nations member state since 1991. Politically, the Marshall Islands is a presidential republic in free association with the United States, with the US providing defense, subsidies, and access to U.S. based agencies such as the Federal Communications Commission and the United States Postal Service. With few natural resources, the islands' wealth is based on a service economy, as well as some fishing and agriculture; aid from the United States represents a large percentage of the islands' gross domestic product. The country uses the United States dollar as its currency.
The majority of the citizens of the Republic of Marshall Islands, formed in 1982, are of Marshallese descent, though there are small numbers of immigrants from the United States, China, Philippines, and other Pacific islands. The two official languages are Marshallese, which is a member of the Malayo-Polynesian languages, and English. Almost the entire population of the islands practises some religion, with three-quarters of the country either following the United Church of Christ – Congregational in the Marshall Islands (UCCCMI) or the Assemblies of God.