Before reunification, NATO’s primary gig was countering the Soviet Union and the Warsaw Pact. West Germany was a frontline state—split from East Germany, a Soviet satellite. The Berlin Wall’s fall in ’89 and Germany’s reunification a year later marked the Cold War’s wind-down. The Soviet Union collapsed in ’91, and suddenly NATO’s big bad wolf wasn’t huffing and puffing anymore. Some folks—like academics John Mearsheimer and Kenneth Waltz—argued this shift killed NATO’s raison d’être. They figured a unified Germany, free of superpower rivalry in Europe, meant the alliance could pack up shop. Why keep a military pact when the enemy’s gone? Says Grok.