easing of hostilities in the 1970s "Milestones: 1969–1976 – Office of the Historian" US - Soviet detente Détente and Arms Control, Détente détente pursuits Stati Uniti e Unione Sovietica Office of the Historian détente Office of the Historian détente Office of the Historian détente Stati Uniti e Unione Sovietica "Milestones: 1969–1976 – Office of the Historian"