French protectorate of Cambodia in the context of "Lon Nol"

French Indochina (previously spelled as French Indo-China), officially known as the Indochinese Union and after 1941 as the Indochinese Federation, was a group of French dependent territories in Southeast Asia from 1887 to 1954. It was initially a federation of French colonies (1887–1949), later a confederation of French associated states (1949–1954). It comprised Cambodia, Laos (from 1899), Guangzhouwan (1898–1945), Cochinchina, and Vietnamese regions of Tonkin and Annam. It was established in 1887 and was dissolved in 1954. In 1949, Vietnam was reunited and it regained Cochinchina. Its capitals were Hanoi (1902–1945) and Saigon (1887–1902, 1945–1954).

The Second French Empire colonized Cochinchina in 1862 and established a protectorate in Cambodia in 1863. After the French Third Republic took over northern Vietnam through the Tonkin campaign, the various protectorates were consolidated into one union in 1887. Two more entities were incorporated into the union: the Laotian protectorate and the Chinese territory of Guangzhouwan. The French exploited the resources in the region during their rule, while also contributing to improvements of the health and education system in the region. Deep divides remained between the native population and the colonists, leading to sporadic rebellions by the former.

Phnom Penh is the capital and most populous city of Cambodia. It has been the national capital since 1865 and has grown to become the nation's primate city and its political, economic, industrial, and cultural centre. The city's name derives from Wat Phnom, a Buddhist temple, and Lady Penh, the city's founder. It sits at the confluence of the Tonlé Sap and Mekong rivers, and is the start of the Bassac River. It is also the seat of Cambodia's monarchy, based at the Royal Palace.

Founded in 1372, Phnom Penh succeeded Angkor Thom as the national capital in 1434 following the fall of Angkor, and remained so until 1497. It regained its capital status during the French colonial era. It underwent a period of investment and modernization during Cambodia's independence period, earning the nickname the "Pearl of Asia" for its colonial French, New Khmer and Art Deco architecture. The city's population swelled in the 1960s and 1970s as refugees fled from civil war and American bombing during the Vietnam War. Phnom Penh's entire population was forcibly evacuated in 1975 by the Khmer Rouge, and faced persecution, forced labour and genocide. Phnom Penh remained largely uninhabited during the Democratic Kampuchea era until Vietnam-backed forces took the city in 1979. The city was reconstructed and infrastructure improved in the modern era with the support of international investment and aid. By 2019, it was home to more than 2 million people, approximately 14% of the Cambodian population.

Battambang (Khmer: បាត់ដំបង, UNGEGN: Bătdâmbâng [ɓatɗɑmɓɑːŋ]) is the capital of Battambang province and the third largest city in Cambodia. The city is situated on the Sangkae River, which winds its way through the province.

Battambang was founded in the 11th century by the Khmer Empire. It later became a major commercial hub and the capital of the Siamese province of Inner Cambodia. It was reintegrated into Cambodia during French colonisation. During the 20th century, Battambang was Cambodia's second largest city, but it was overtaken by the growth of Siem Reap. It was impacted by conflict and genocide in the 20th century, with the city forcibly evacuated during the Democratic Kampuchea period. It was also the site of fighting during the Khmer Rouge insurgency until the 1990s.

The post-Angkor period of Cambodia (Khmer: ប្រទេសកម្ពុជាក្រោយសម័យអង្គរ), also called the Middle period, refers to the historical era from the early 15th century to 1863, the beginning of the French protectorate of Cambodia. As reliable sources (for the 15th and 16th centuries, in particular) are very rare, a defensible and conclusive explanation that relates to concrete events that manifest the decline of the Khmer Empire, recognised unanimously by the scientific community, has so far not been produced. However, most modern historians have approached a consensus in which several distinct and gradual changes of religious, dynastic, administrative and military nature, environmental problems and ecological imbalance coincided with shifts of power in Indochina and must all be taken into account to make an interpretation. In recent years scholars' focus has shifted increasingly towards human–environment interactions and the ecological consequences, including natural disasters, such as flooding and droughts.

Stone epigraphy in temples, which had been the primary source for Khmer history, is already a rarity throughout the 13th century, ends in the third decade of the fourteenth, and does not resume until the mid-16th century. Recording of the Royal Chronology discontinues with King Jayavarman IX Parameshwara (or Jayavarma-Paramesvara), who reigned from 1327 to 1336. There exists not a single contemporary record of even a king’s name for over 200 years. Construction and maintenance of monumental temple architecture had come to a standstill after Jayavarman VII's reign. According to author Michael Vickery there only exist external sources for Cambodia’s 15th century, the Chinese Ming Shilu ("Veritable Records") and the earliest Royal Chronicle of Ayutthaya, which must be interpreted with greatest caution.

Norodom Sihanouk (/ˈsiː.ənʊk/; 31 October 1922 – 15 October 2012) was a member of the House of Norodom who led Cambodia as King, Chief of State and Prime Minister. He is known as Samdech Euv (meaning "King Father"). During his lifetime, Cambodia was under various regimes, from French colonial rule (until 1953), a Japanese puppet state (1945), an independent kingdom (1953–1970), a military republic (1970–1975), the Khmer Rouge regime (1975–1979), a Vietnamese-backed communist regime (1979–1989), a transitional communist regime (1989–1993) to eventually another kingdom (since 1993).

Sihanouk was the only child of Prince Norodom Suramarit and Princess Sisowath Kossamak, daughter of King Sisowath Monivong. When his grandfather Monivong died in 1941, Sihanouk became king amidst French colonial rule. After the Japanese occupation of Cambodia during World War II, he secured Cambodian independence from France in 1953. He abdicated in 1955 and was succeeded by his father, Suramarit, so as to directly participate in politics. Sihanouk's political organization Sangkum won the general elections that year, and he became prime minister of Cambodia. He governed the country under one-party rule and suppressed political dissent. After his father died in 1960, Sihanouk assumed a new position as Chief of State of Cambodia.

Kun Khmer (Khmer: គុនខ្មែរ [kun kʰmae] lit. 'Khmer martial arts'), or Pradal Serey (Khmer: ប្រដាល់សេរី [prɑɗal seːrəj] lit. 'free boxing'), is a combat sport that originated in Cambodia. The sport consists of stand up striking and clinch fighting, where the objective is to knock an opponent out, force a technical knockout, or win a match by points. The sport was codified in Cambodia by the French colonial administration in the early 20th century, and was derived from centuries-old traditions, namely Bokator, the close-quarter combat system used during the Khmer empire. The official name of the sport in Khmer is Kbach Kun Pradal Khmer (Khmer: ក្បាច់គុនប្រដាល់ខ្មែរ [kʰɓac kun prɑɗal kʰmae] lit. 'Khmer martial art of boxing').

The Native code (French: Code de l'indigénat ) was a diverse and fluctuating set of arbitrary laws and regulations which created in practice an inferior legal status for natives of French colonies from 1881 until 1944–1947.

The Native code was introduced by decree, in various forms and degrees of severity, to Algeria and Cochinchina in 1881, New Caledonia and Senegal in 1887, Annam–Tonkin and Polynesia in 1897, Cambodia in 1898, Mayotte and Madagascar in 1901, French West Africa in 1904, French Equatorial Africa in 1910, French Somaliland in 1912, and the Mandates of Togo and Cameroon in 1923 and 1924.