Making Sense with Sam Harris

#441 — The Threat of Civil War

October 31, 2025

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  • From a Canadian perspective, the current state of the US under potential second Trump administration is viewed as terrifying, leading Canada to seriously consider drastic security and trade diversification measures, including whole society defense strategies. 
  • The potential for a modern American civil war is modeled not as a traditional state-versus-state conflict, but as an explosion of expanded political violence fueled by cascading factors like demographic shifts (minority-majority transition), declining institutional trust, extreme inequality, and hyperpartisanship. 
  • Stephen Marche argues that Donald Trump is a symptom, not the root cause, of America's instability, which stems from deeper breakdowns in trusted institutions and the American dream, making blaming Trump alone an insufficient analysis. 

Segments

Podcast Introduction and Guest Background
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(00:00:06)
  • Key Takeaway: Stephen Marche’s writing career transitioned from Shakespeare professor to freelance writer, leading to his book project after covering the 2016 Trump inauguration for a Canadian magazine.
  • Summary: The introduction confirms the listener is hearing only the first part of the episode of Making Sense with Sam Harris unless subscribed. Stephen Marche detailed his varied career, including being a columnist for Esquire and writing features for major publications. His focus on the US political situation began with an assignment to cover Donald Trump’s inauguration in 2016.
Canadian View of US Politics
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(00:01:43)
  • Key Takeaway: Canadians perceive the US political landscape as terrifying, likening the situation to a volatile ‘big brother’ figure, causing over half of Canadians to view the US as an enemy.
  • Summary: Marche describes the Canadian public’s view of the US as deeply alarming, necessitating drastic political and security changes in Canada. Over half of Canadians now consider the US an enemy due to the perceived threat of a second Trump administration. The idea of the US annexing Canada (the 51st state talk) is considered a serious risk, not just a troll, given the slide toward authoritarianism in the US.
US Conquest and Canadian Defense
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(00:03:46)
  • Key Takeaway: Canada is seriously discussing adopting a ‘whole society defense’ strategy, similar to Finland’s approach against Russia, which may involve national service or conscription to deter potential aggression.
  • Summary: While acknowledging the difficulty of a full US conquest, Marche notes that Canada is not powerless and is considering becoming a nuclear power. More immediately, they are discussing ‘whole society defense,’ making any conquest prohibitively painful for the aggressor. This strategy is being seriously discussed in response to US instability.
Concerns Regarding Trump’s Second Term
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(00:05:32)
  • Key Takeaway: The primary concern regarding a second Trump administration is the ‘flood the zone’ strategy of chaos and unreliability, creating an imminent danger because the US appears to be a ‘bus going off the cliff’ to which Canada is closely attached.
  • Summary: Marche identifies the top concern as the pervasive chaos and unpredictability of the administration’s actions. This instability is painful for Canada due to deep intertwining in family, work, and media connections. The inability to know what will happen next week is the most frightening aspect of the incipient chaos emerging from America.
Contrasting Views on American Strength
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(00:07:18)
  • Key Takeaway: Supporters of Trumpism view his actions as strength, citing the forcing of allies to pay defense costs and resetting trade expectations, while Marche counters that 21st-century power relies on alliance networks, scientific base, and soft power, all of which are being damaged.
  • Summary: Marche addresses the perspective that Trump projects strength by solving the ‘free rider problem’ with European allies and norm-busting. However, Marche argues that true 21st-century power is built on trade networks, scientific communities, and soft power, all of which are being thrown away. He notes that many Americans, regardless of party, recognize the constitutional order is breaking down.
Book Research and Civil War Models
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(00:11:14)
  • Key Takeaway: Marche’s book synthesizes academic models of civil war (like those from Prio) with insights from 200 interviews across the political spectrum to project plausible scenarios for 21st-century American conflict.
  • Summary: The book, based on a 2018 article, uses fictional vignettes to illustrate projections derived from political and decline models. Marche interviewed approximately 200 people, including white power and far-left groups, to provide human context to the dry models. He emphasizes that the civil war he models is characterized by expanded political violence, not state-versus-state battles.
Risk Factors for Civil War
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(00:16:03)
  • Key Takeaway: Civil wars are complex cascading systems where environmental factors, the transition to a minority-majority country (a major global predictor of political violence), and declining institutional trust combine to create threat multipliers.
  • Summary: Civil wars result from a combination of factors, not a single cause. The shift toward a minority-majority US population by 2040 is cited as a significant historical predictor of political violence globally. This is compounded by a continuous decline in trust across all institutions since 1980 and extreme levels of vertical and horizontal inequality.
Hyperpartisanship and Norm Collapse
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(00:19:45)
  • Key Takeaway: The current level of hyperpartisanship, characterized by frank hatred and a tit-for-tat political war where norms are violated if one can get away with it, is at a level not seen in the US since before the modern era, surpassing even post-Watergate levels.
  • Summary: Hyperpartisanship is the most visible precursor to civil war, involving open hatred between political sides. The expectation of fairness in politics has vanished, replaced by a strategy of doing whatever is possible before the other side gains power. This level of partisan animosity has not been present since approximately 1876.