The history of Sihanoukville goes back only as far as 1955 when the area was known as Kampong Som. In August of that year, a French/Cambodian construction team cut a base camp into the unoccupied jungle where the Hawaii Seaview Restaurant now sits. They laid the groundwork for the construction of the new Port of Kampong Som - a project that had been set into motion by the 1954 dissolution of French Indochina.
Prior to 1954, Cambodia maintained international sea trade via the Mekong. But the end of Indochina meant the Mekong delta reverted to the control of Vietnam. Seeking unfettered access to the ocean, plans were made to construct a new ocean port. Kampong Som was selected for water depth and ease of access.
Construction of the port and Route 4 (the road to Phnom Penh) was carried out from 1955-1960. Funds for construction of the port came from France, and from the USA for the road. The town began as housing for workers just south of the port. Upon completion, the town was renamed Sihanoukville in honor of the King.
Sihanoukville’s heyday came in the 1960s. Although Kep was more popular as a holiday destination, the commercial success of the port led to a flurry of construction and expansion including the construction of the Independence Hotel (abandoned but still exists on Independence Beach in a dilapidated state ), the original Angkor Brewery (closed in 1975 and reopened in 1991), a Truck & Tractor Plant, Wat Chotynieng (aka Wat Leu), St Michael's Catholic Church (constructed in 1960, closed in 1975 and reopened in 1993), dozens of villas on Ochheuteal Beach (destroyed in the 1980s) and other structures. There was also a second phase of port construction, which began in 1965 and halted with the Lon Nol coup d'etat of 1970.
Sihanoukville entered the history of the American/Vietnam conflict when, during the late 1960’s and early 70’s, it served as a transit point for weapons bound for anti-American forces in Vietnam. The town’s most direct involvement came on May 13, 1975 when the Khmer Rouge captured the S.S. Mayaguez, a U.S. container ship. As part of an attempt to release the ship, the U.S. attacked Koh Tang, an island near Sihanoukville, and met fierce resistance, suffering heavy losses.