With racial harmony being the zeitgeist of many political rhetoric across the world, discourses on understanding ethnicities and nations that go through troubled history are as important as ever. Intergenerational trauma is ubiquitous in discussing fictional works that involve themes tantamount to significant events like World War II, racial segregation, gender discrimination in family institutions, and political strife, which is the core of the narrative in Junot Diaz's The Brief Wondrous Life of Oscar Wao. The objective of this research is to fill in the gap left in previous research on the presence of trauma, where most of the focus is only on intergenerational trauma aspect of the plot that contributes to the trauma, not on Oscar's struggles with Dominican identity crisis which resulted from said trauma. The methodology that the research will be using is on exploring Mervyn Bendle's four modern problems of identity crisis, with the first being that the self is seen as an inner place that can to be examined by the narrator, the second is the idea of human potential, the third being crumbling idea of hierarchy, and lastly, the change of self-definition. The research concludes that the main character's identity crisis, where he struggles as both an American and a Dominican, is a result of an intergenerational fear towards the long deceased Dominican Republic's infamous dictator, Rafael Trujillo. The trauma was reinforced in the protagonist's upbringing, causing him to bear consistent resentment towards society in his brief lifetime. It is suggested that future research examine other ethnicities or communities affected by similar intergenerational traumas in other works of fiction, so a much greater case can be built in gaining better insight on how such external tormentor can be a burden on generations to come.