Cambodia becomes independent from France.

King Norodom Sihanouk of Cambodia abdicates the throne in favor of his father, King Norodom Suramarit.

Albania, Austria, Bulgaria, Cambodia, Finland, Hungary, Ireland, Italy, Jordan, Laos, Libya, Nepal, Portugal, Romania, Spain and Sri Lanka join the United Nations.

A parcel bomb sent by Ngo Dinh Nhu, younger brother and chief adviser of South Vietnamese President Ngo Dinh Diem, fails to kill King Norodom Sihanouk of Cambodia.

Vietnam War: In a propaganda ceremony in Phnom Penh, Cambodia, three American prisoners of war are released by the Viet Cong and turned over to "new left" antiwar activist Tom Hayden.

The United States begins secretly bombing the Sihanouk Trail in Cambodia, used by communist forces to infiltrate South Vietnam.

Lon Nol ousts Prince Norodom Sihanouk of Cambodia.

Vietnam War: U.S. President Richard M. Nixon formally authorizes American combat troops to fight communist sanctuaries in Cambodia.

Vietnam War: United States and South Vietnamese forces invade Cambodia to hunt Viet Cong.

Protests erupt in Seattle, Washington, following the announcement by U.S. President Richard Nixon that U.S. Forces in Vietnam would pursue enemy troops into Cambodia, a neutral country.

Vietnam War: Kent State shootings: the Ohio National Guard, sent to Kent State University after disturbances in the city of Kent the weekend before, open fire killing four students and wounding nine others. The students were protesting the United States' invasion of Cambodia.

The Khmer Republic is proclaimed in Cambodia.

U.S. President Richard Nixon asks the U.S. Congress for $155 million USD in supplemental aid for the Cambodian government.

In Cambodia, Khmer Rouge forces attack the city of Phnom Penh and its airport, killing 44, wounding at least 30 and damaging nine aircraft.

Cambodian Civil War: Khmer Rouge rebels intensify assaults on Cambodian government positions, forcing their retreat from Kompong Thmar and nearby Ba Ray.

The United States Senate votes to cut off funding for the bombing of Khmer Rouge targets within Cambodia, hastening the end of the Cambodian Civil War.

Vietnam War: In testimony by Assistant Secretary of Defense Jerry Friedheim to the US Senate Committee on Armed Services, the US Defense Department admits it lied to US Congress about bombing Cambodia .

Vietnam War: The United States bombing of Cambodia ends.

The Cambodian Civil War ends. The Khmer Rouge captures the capital Phnom Penh and Cambodian government forces surrender.

Mayagüez incident: the Cambodian navy seizes the American merchant ship SS Mayaguez in international waters.

Cambodia is renamed the Democratic Kampuchea by the Khmer Rouge.

Prince Norodom Sihanouk resigns as leader of Cambodia and is placed under house arrest.

Cambodian Prince Norodom Sihanouk returns to Phnom Penh after thirteen years of exile.

Leaders of the Khmer Rouge apologize for the 1970s genocide in Cambodia that claimed over 1 million lives.

Cambodia joins the Association of Southeast Asian Nations (ASEAN) bringing the number of members to 10.

King Norodom Sihanouk of Cambodia abdicates.

Typhoon Ketsana (2009) hit the Philippines, China, Vietnam, Cambodia, Laos and Thailand, causing 700 fatalities.