1953 Cambodia becomes independent from France.
1970 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.
1970 The Khmer Republic is proclaimed in Cambodia.
1973 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 .
1976 Cambodia is renamed the Democratic Kampuchea by the Khmer Rouge.
1976 Prince Norodom Sihanouk resigns as leader of Cambodia and is placed under house arrest.
1999 Cambodia joins the Association of Southeast Asian Nations (ASEAN) bringing the number of members to 10.