In this episode of Explaining History, Nick explores the emergence of the “New Left” in 1960s America—a movement born from the failure of Cold War liberalism to deliver on its promises.

Drawing on Kim McQuaid’s The Anxious Years, we delve into the deep disillusionment that fuelled student radicalism. Why did young activists view “vital centre” liberals like JFK and LBJ not as allies, but as “closet right-wingers” trapped in an imperialist mindset? We examine the “bipartisan banality” of the era, where fear of being labelled “soft on communism” drove Democrats to escalate wars in Vietnam and Cuba, often with more ferocity than their Republican counterparts.

From the devastating psychological blow of the Tet OffensiveTet Offensive tet-offensive The coordinated surprise attacks launched by North Vietnamese and Viet Cong forces on 30 January 1968 against more than 100 South Vietnamese cities and towns, including Saigon. Although the military offensive was repelled with heavy communist losses, its political impact in the United States was decisive — it destroyed public confidence in the official narrative that the war was being won. The Tet Offensive — timed to coincide with the Vietnamese lunar new year — violated the informal ceasefire that normally accompanied the holiday and targeted urban centres that the US military command had described as pacified. The assault on the US Embassy compound in Saigon, where Viet Cong sappers briefly penetrated the compound before being killed, was broadcast live on American television. The battle of Hue — where North Vietnamese forces occupied the imperial capital for 25 days before being driven out at enormous cost — destroyed one of South Vietnam’s most historic cities and produced documented evidence of communist executions of civilians. Khe Sanh, a US Marine base besieged for 77 days, created fears of a second Dien Bien Phu. In military terms, the offensive was a failure for North Vietnam: the expected popular uprising in South Vietnam did not materialise, the Viet Cong suffered catastrophic losses (approximately 40,000 dead), and most objectives were held only briefly before being recaptured. But militarily the offensive was not primarily designed to win territory — it was designed to demonstrate that the Johnson administration’s optimistic briefings were false, that the ‘light at the end of the tunnel’ did not exist. In this psychological and political objective, it succeeded completely. Tet demonstrated that in a democratic society, the relationship between military reality and political reality is mediated by narrative — and that a narrative sustained by institutional credibility can be destroyed in a single news cycle by events visible to television cameras. The ‘credibility gap’ between official optimism and battlefield reality had been building for years; Tet collapsed it in 72 hours. Walter Cronkite’s editorial broadcast from Vietnam on 27 February 1968 — ‘It seems now more certain than ever that the bloody experience of Vietnam is to end in a stalemate’ — reflected and accelerated a shift in establishment opinion that made the war politically untenable. Johnson announced he would not seek re-election on 31 March 1968. The lesson American military strategists drew — that the media had lost the war by undermining public support for a militarily sound effort — misread the causality. The problem was not that the media showed the gap between official claims and reality; the problem was the gap itself, and the institutional decisions to maintain false optimism in official communications that made the gap unsustainable when reality arrived. to the collapse of trust in the “foreign policy establishment,” we uncover why 1968 became the year the liberal consensus shattered.

Plus: Big announcements about our upcoming live masterclasses for history students in January and February 2026!

Key Topics:

• The New Left: How the SDS and student radicals challenged the “Old Left” and the liberal establishment.
• Cold War Liberalism: Why Democrats felt compelled to “out-hawk” the Republicans.
• The Credibility Gap: How the Tet Offensive exposed the lies of the war managers.
• The “Deep State”: The