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| 1970, March 13 |
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| The Cambodian government requested the North Vietnamese to withdraw their troops. Conferences followed. | 1 |
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| March 18 |
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| PREMIER LON NOL TOOK CONTROL OF THE GOVERNMENT in the absence of Prince Sihanouk in Beijing. | 2 |
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| April 27 |
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| The North Vietnamese government proclaimed its support of Sihanouk (See March 18). Communist forces began to press their advance into Cambodia and threatened Phnom Penh. | 3 |
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| April 30 |
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| The U.S. announced that its troops would join South Vietnamese forces in an invasion of Cambodia (See April 30) to destroy North Vietnamese and Viet Cong bases near the border of South Vietnam. This news caused a furor in the U.S., where opinion ran strongly against any escalation of the war. U.S. troops were withdrawn by June 29. | 4 |
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| Oct. 9 |
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| PROCLAMATION OF THE KHMER REPUBLIC as the new name for Cambodia. Initially, some party politics were allowed: Son Ngoc Thanh even served as prime minister for several months. But as the war began to go very badly for the republic forces, Gen. Lon Nol became repressive. | 5 |
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