Short answers, pulled from the story.
Identity in social science is the set of qualities, beliefs, personality traits, appearance, and expressions that characterize a person or a group. It serves multiple functions, acting as a self-regulatory structure that provides meaning, direction, and a sense of self-control. It is shaped by both personal development and social and cultural factors.
Erik Erikson (1902-1994) introduced the concept of ego identity, describing it as an individual's personal sense of continuity that develops as an ongoing process throughout life. He proposed eight stages of psychosocial development, each involving a conflict between the inner personal world and the outer social world. He identified adolescence as the primary period of identity conflict, with outcomes ranging from identity diffusion to foreclosed identities.
James Marcia's 1966 Neo-Eriksonian identity status paradigm identifies four statuses based on exploration and commitment. Identity diffusion describes avoidance of both; foreclosure describes commitment without prior exploration; identity moratorium describes active exploration without yet committing; and identity achievement describes having both explored many possibilities and committed to an identity.
Social anthropologists such as Cohen and Bray, following Fredrik Barth's approach to ethnicity, shifted analytical focus from the content of identity to the boundaries that define it. Boundaries are made visible through markers such as language, dress, behavior, and choice of space. These markers can create inclusive or exclusive boundaries depending on how they are perceived by others.
The modern notion of personal identity developed through several historical forces, including the issuance of the first passports in the early 1900s, the emergence of psychology as a field in the 19th century, the Renaissance era's growing sense of privacy, and the industrial period's shift to specialized worker roles. The concept of occupation as a crucial aspect of identity was formally introduced by Christiansen in 1999.
Immigration and acculturation typically lead to shifts in social identity, with the extent of change depending on disparities between the heritage culture and the host country's culture. A strong personal identity can act as an anchor, playing a protective role during the social and cultural transformations that accompany immigration and acculturation.