What is the theory of civil or intrastate war that focuses on the psychological need to belong to groups that have positive and distinct identities?

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The theory that focuses on the psychological need to belong to groups that have positive and distinct identities is social identity theory. This theory suggests that individuals have a basic psychological need for a positive social identity, which they can attain by being a part of a group with a positive and distinct identity. This can lead to intrastate conflict, as groups may compete with each other for resources and recognition. The resource curse (A) refers to the negative consequences that can arise from a country's natural resource wealth, and is not specifically focused on civil war. Irredentism (B) refers to the desire to reclaim territory that is believed to be a part of a country or cultural group, which can contribute to interstate conflicts but is not specifically focused on civil war. The theory of relative deprivation (D) suggests that people may become more likely to engage in political violence when they perceive their own group as being deprived compared to other groups, but does not explicitly focus on the need for positive group identity.

What Is the Theory of Civil or Intrastate War That