World War II: Tarawa and Makin atolls fall to American forces.

Tarawa is an atoll and the capital of the Republic of Kiribati, in the Micronesia region of the central Pacific Ocean. It comprises North Tarawa, which has 6,629 inhabitants and much in common with other more remote islands of the Gilbert group, and South Tarawa, which has 56,388 inhabitants as of 2015, half of the country's total population. The atoll was the site of the Battle of Tarawa during World War II.

Butaritari is an atoll in the Pacific Ocean island nation of Kiribati. The atoll is roughly four-sided. The south and southeast portion of the atoll comprises a nearly continuous islet. The atoll reef is continuous but almost without islets along the north side. Bikati and Bikatieta islets occupy a corner of the reef at the extreme northwest tip of the atoll. Small islets are found on reef sections between channels on the west side. The lagoon of Butaritari is deep and can accommodate large ships, though the entrance passages are relatively narrow. It is the most fertile of the Gilbert Islands, with relatively good soils and high rainfall. Butaritari atoll has a land area of 13.49 km² (5.21 sq mi) and a population of 3,224 as of 2015. During World War II, Butaritari was known by United States Armed Forces as Makin Atoll, and was the site of the Battle of Makin. Locally, Makin is the name of a separate but closest atoll, 3 kilometres to the northeast of Butaritari, but close enough to be seen. These two atolls share a dialect of the Gilbertese language.

An atoll is a ring-shaped island, including a coral rim that encircles a lagoon. There may be coral islands or cays on the rim. Atolls are located in warm tropical or subtropical parts of the oceans and seas where corals can develop. Most of the approximately 440 atolls in the world are in the Pacific Ocean.