Historical trauma

Definition and Conceptual Foundations

Historical trauma is defined as the psychological reactions to a traumatic event that affect an entire society. It does not merely reflect a historical fact but is a memory embedded in the collective identity of a group. The term highlights how tragedies are reconstructed in collective memory as groups attempt to make sense of them over time. Scholar Gilad Hirschberger clarifies that collective trauma exists when a group's identity is shaped by the memory of a shared catastrophic experience. This trauma operates on two levels: the identity group level, affecting groups defined by race, ethnicity, or religion, and the broader society level, influencing the fabric of a nation or transnational community. For trauma to be considered collective, it must be used as a key marker for group identity and self-definition in public discourse. The manifestations of this trauma are woven through collective narratives, collective emotions, and collective mental models or values that guide a community's worldview and interactions. American sociologist Kai Erikson was one of the first to document collective trauma in his book Everything in Its Path, which studied the aftermath of a catastrophic flood in 1972.

Origins and Development of the Concept

The specific concept of Indigenous Historical Trauma (IHT) was first developed in the 1980s by social worker and researcher Maria Yellow Horse Brave Heart while working with Lakota communities. Her scholarship focused on the psychological legacy of colonization, forced relocation, cultural assimilation, and the American Indian boarding school system. In her seminal 2000 article Wakiksuyapi: Carrying the Historical Trauma of the Lakota, she compared the manifestations of trauma in Holocaust survivors and Native American peoples, concluding they exhibited similar psychological wounds despite different causative events. This foundational work spurred further research into intergenerational trauma mechanisms by scholars like Daniel Schechter, Joy DeGruy, and Rachel Yehuda. The concept gained significant clinical and academic traction in the early 21st century, leading to a 2019 systematic review by University of Michigan psychologists on IHT and health outcomes for Indigenous peoples in the United States and Canada. The 2018 documentary Dodging Bullets, Stories from Survivors of Historical Trauma brought firsthand testimonies from Dakota, Lakota, Ojibwe, and Blackfeet communities to a wider audience, alongside expert analysis from sociologist Melissa Walls and others.

Colonial Policies as Causes in Canada

For Indigenous nations in Canada, historical trauma is rooted in a series of deliberate colonial policies and systemic actions designed to dispossess and assimilate them. The arrival of European settlers initiated a process where Indigenous governance systems and relationships to the land were disregarded in favour of resource extraction and settlement. Key reports like the Bagot Commission (1844) and the Davin Report (1879) laid the groundwork for the residential school system, where children were forcibly removed from their families to be assimilated. The explicit goal, as articulated by advocate Richard Henry Pratt, was to kill the Indian in the child, and save the man. These policies collectively aimed at severing cultural transmission, disrupting families, and destroying traditional ways of life, creating the conditions for multigenerational, cumulative trauma. Children in these institutions were subjected to practices designed to strip their cultural identity, such as having their hair cut and being forbidden to speak their native languages. Many endured severe physical and sexual abuse, neglect, and malnutrition. The stress, fear, and loneliness experienced in these schools have been linked to high rates of depression and other mental health disorders among survivors. The trauma inflicted was not confined to individual students but reverberated through families and communities, breaking down traditional parenting models and social structures.

Mechanisms of Intergenerational Transmission

Historical trauma affects not only those who directly experience catastrophic events but also their descendants through intergenerational transmission. This means the stress, harm, and adaptive coping mechanisms are passed down across generations, a process often referred to as transgenerational trauma. Trauma can be transmitted through several key pathways that alter family and community dynamics. These pathways include learned behaviours where maladaptive coping strategies like substance abuse are modelled, communication patterns within families that may avoid discussing painful history, and parenting challenges where survivors may struggle with attachment due to their own childhood disruptions. Emerging research in epigenetics suggests that the physiological stress of trauma can cause chemical modifications to gene expression, which may be inherited, potentially making subsequent generations more biologically vulnerable to stress and mental health challenges even without direct exposure to the original event. The effects of this transmission accumulate over generations, leading to complex community-wide challenges. In the second generation, children of survivors may experience emotional distance, role confusion, and difficulty expressing emotions due to the unresolved grief carried by their parents. By the third generation, the compounded effects can include a pervasive sense of identity confusion, internalized racism, and a disconnection from cultural heritage. This intergenerational cycle means that the injuries inflicted by policies like residential schools are continuous and ongoing, affecting Indigenous youth today who may lack awareness of the ancestral experiences that shape their present-day psychological landscape. This lack of awareness can inadvertently perpetuate cycles of substance abuse, violence, and suicide attempts within communities.

Health and Social Effects

The legacy of historical trauma manifests in significant health disparities and social challenges within Indigenous communities in Canada. Research consistently shows higher rates of chronic physical and mental health conditions compared to the non-Indigenous population. These effects are direct outcomes of the chronic, systemic stress and disruption caused by colonial policies. Common health issues linked to historical trauma include higher prevalence of chronic illnesses such as diabetes and heart disease, increased rates of mental health struggles including depression, anxiety, and post-traumatic stress disorder. There are also significantly higher rates of substance abuse and alcoholism, which are often used as coping mechanisms for unresolved pain. Communities experience increased suicide rates, particularly among youth, and face greater social challenges like systemic poverty, lower educational attainment, and overrepresentation in the child welfare and justice systems. The psychological toll is deep, with trauma often internalized, leading to low self-esteem, anger, and difficulty in recognizing and expressing emotions. The Truth and Reconciliation Commission and Australia's Bringing Them Home report both detailed the clear connection between these present-day disparities and the historical experiences of government-sponsored assimilation policies. For example, the loss of cultural identity and forced removal from family have been directly correlated with the high rates of alcoholism and suicide observed in many Indigenous communities. These are not indicators of personal failing but are understood as symptoms of a deep, collective wound that has been transmitted across generations without adequate opportunity for healing or redress.

Pathways to Healing and Resilience

While the effects of historical trauma are significant, healing is possible through cultural reconnection, community-led initiatives, and policy changes that support Indigenous self-determination. A central framework for healing is enculturation, a process that helps individuals reconnect with their heritage. Studies show that this process can reduce mental health challenges such as suicidal ideation and depression, particularly among younger generations. Healing is also supported by truth-telling and formal recognition of injustices, as seen in the work of the Truth and Reconciliation Commission and the compensation processes established by the 2006 Indian Residential Schools Settlement Agreement. Community well-being improves markedly when Indigenous nations have greater control over their own decisions, lands, and resources, a principle known as self-governance. Key approaches to promoting health and supporting healing include investing in community-based, culturally grounded trauma counselling and traditional healing practices. It is also vital to support language revitalization programs and the intergenerational transmission of cultural knowledge. Implementing the calls to action from the TRC and supporting Indigenous-led child welfare and education systems are critical policy steps. The establishment of the Aboriginal Healing Foundation in 1998, based on survivor advocacy, provided crucial resources for community healing projects. Survivors like Nora Bernard, who started meeting fellow survivors around her kitchen table in 1987, and Phil Fontaine, who first spoke publicly of his abuse in 1990, have been central to the movement for recognition and healing.

• Cultural Reconnection: Engaging in language, ceremony, and traditional practices to rebuild identity.
• Truth and Reconciliation: Public acknowledgement of historical injustices and commitment to repair.
• Community Control: Supporting Indigenous self-governance and decision-making over health, child welfare, and education.
• Intergenerational Support: Creating programs that heal families and strengthen parenting across generations.
• Trauma-Informed Care: Developing health and social services that understand the historical context of present-day issues.
• Land and Resource Rights: Honouring treaties and supporting economic self-sufficiency tied to cultural values.

Survivor Advocacy and National Reconciliation

The term Survivor is now widely used to honour those who attended residential schools and lived to tell their stories, while also acknowledging the thousands of children who never returned home. Survivor advocacy has been the driving force behind Canada's reckoning with this history. For decades, survivors shared their stories through memoirs, art, and song, though they were often met with public disbelief or indifference. Organized advocacy gained momentum in the late 1980s and 1990s, as survivors began forming groups and launching lawsuits against church and government entities. A central figure was Nora Bernard, a Mi'kmaq survivor of the Shubenacadie Residential School, who began gathering survivors in her Dartmouth, Nova Scotia home in 1987. Her group grew into a national association that was instrumental in the fight for compensation, culminating in the landmark 2006 Indian Residential Schools Settlement Agreement, the largest class-action settlement in Canadian history. Bernard was posthumously awarded the Order of Nova Scotia in 2008. This settlement established the Truth and Reconciliation Commission, a compensation process, and healing initiatives. By 2017, over 38,000 claims for serious sexual and physical abuse had been processed, and more than 80,000 survivors received a Common Experience Payment acknowledging the inherent harm of attending the schools. The public testimony of leaders like Phil Fontaine, former National Chief of the Assembly of First Nations, who spoke out in 1990 about the abuse he suffered, was crucial in breaking the silence and validating the experiences of thousands.

Historical Trauma in Global Context

While this article focuses on Indigenous experiences in Canada, historical trauma is a global phenomenon affecting many groups who have endured mass catastrophic events. The framework developed to understand Indigenous trauma has parallels in the study of other communities. Well-documented cases include the transgenerational impact of the Holocaust on Jewish communities, where studies have shown psychological and epigenetic effects in descendants of survivors. The legacy of slavery and systemic racism continues to inflict trauma on African American communities, as analyzed in works like Joy DeGruy's Post Traumatic Slave Syndrome. Other examples include the collective trauma of the Armenian genocide, the Palestinian Nakba, and the Stolen Generations of Aboriginal and Torres Strait Islander peoples in Australia. Each case involves a devastating event or prolonged period of persecution that disrupts cultural continuity, damages social fabric, and leaves a psychological legacy that can span generations. The common thread is that the trauma becomes a part of the group's collective identity and memory, shaping its worldview and health outcomes long after the precipitating events have ended. Research across these different populations has converged on similar findings regarding transmission and manifestation. Scholars like Judith Kestenberg, Dori Laub, and Yael Danieli have contributed foundational work on Holocaust trauma. The recognition of historical trauma challenges purely individual or biomedical models of mental health by insisting on the importance of social, historical, and political context. It shows that healing for afflicted communities often requires not only individual therapy but also societal recognition, justice, the restoration of cultural sovereignty, and the repair of the social and economic conditions that perpetuate disadvantage.

Questions about Historical trauma

What is historical trauma?

Historical trauma, also called collective trauma, is the cumulative emotional and psychological harm across generations that affects an entire cultural group or community. It results from a shared history of catastrophic events like genocide, colonization, forced assimilation, or systemic oppression. In Canada, it primarily refers to the impacts of colonial policies such as the residential school system, the Sixties Scoop, and the Indian Act on Indigenous peoples. The trauma is embedded in the collective memory and identity of the group, influencing health, behaviour, and social conditions long after the original events.

How is historical trauma passed down through generations?

Historical trauma is transmitted intergenerationally through several pathways. These include learned behaviours, where children adopt coping mechanisms like substance abuse from parents. Disrupted family communication and parenting patterns due to a parent's own childhood trauma. And the vicarious stress of growing up with a caregiver's unresolved pain. Research in epigenetics also suggests that extreme stress can cause chemical changes to gene expression that may be inherited, potentially increasing biological vulnerability to stress in descendants. This means the effects are not just psychological but can have a physiological component passed from one generation to the next.

What are some specific effects of historical trauma on Indigenous communities in Canada?

The effects are widespread and interconnected, contributing to significant health and social disparities. These include higher rates of chronic diseases like diabetes and heart conditions, increased levels of mental health issues such as depression, anxiety, and PTSD, and tragically high rates of suicide, particularly among youth. Communities also experience higher prevalence of substance abuse and alcoholism, which are often coping mechanisms for unresolved pain. Socially, there are greater levels of poverty, lower educational attainment, and overrepresentation of Indigenous children in the foster care system and adults in the justice system, all rooted in the disruption caused by colonial policies.

What was the Indian Residential Schools Settlement Agreement?

The Indian Residential Schools Settlement Agreement, finalized in 2006, was the largest class-action settlement in Canadian history. It was the result of years of litigation and advocacy by survivors like Nora Bernard and organizations including the Assembly of First Nations. The agreement provided compensation to survivors through a Common Experience Payment for all who attended the schools and an Independent Assessment Process for claims of serious sexual or physical abuse. It also established the Truth and Reconciliation Commission, funded healing initiatives through the Aboriginal Healing Foundation, and provided resources for commemoration projects. By 2017, over 80,000 survivors had received common experience payments.

What is enculturation and how does it support healing?

Enculturation is a process identified as a key pathway for healing from historical trauma. It involves gaining knowledge and awareness of one's own cultural history and traditions, participating in cultural practices, ceremonies, and community events, and developing a secure, positive cultural identity by integrating this knowledge and participation. Research shows this process can significantly reduce mental health challenges like suicidal thoughts and depression, especially for younger generations. It works by rebuilding a sense of belonging, pride, and continuity that was deliberately attacked by assimilationist policies.

How can non-Indigenous Canadians contribute to addressing historical trauma?

Non-Indigenous Canadians can contribute by educating themselves on the true history of colonization and its ongoing impacts, as outlined by the Truth and Reconciliation Commission's reports and Calls to Action. Supporting the implementation of these Calls to Action in areas like education, justice, and health care is crucial. This includes advocating for government policies that support Indigenous self-determination and land rights. On a personal level, it involves listening to and amplifying Indigenous voices and stories, supporting Indigenous-led businesses and organizations, and challenging racism and stereotypes. The goal is to be an ally in creating a society based on mutual respect and the recognition of rights, which is foundational for healing.

Sources and further reading

• Historical trauma (Wikipedia)
• 9. Historical trauma and Indigenous communities (canemerg-urgencecan.com)
• Redress and Healing (indigenouspeoplesatlasofcanada.ca)

Checked by the Nosy Mag desk. Last updated 2026-11-01.