What why was detente in danger of coming to an end?

Détente, the easing of tensions between the United States and the Soviet Union during the Cold War, was in danger of collapsing due to several factors. The Soviet invasion of Afghanistan in 1979 marked a significant escalation of Cold War tensions, prompting the U.S. to respond with economic sanctions and a boycott of the 1980 Moscow Olympics. Additionally, increasing arms race competition and ideological confrontations, such as the rise of anti-communist movements, further strained relations and diminished the prospects for continued diplomatic engagement. These developments ultimately signaled a return to more confrontational policies on both sides.