Citizenship and Political Membership

Core Idea

Citizenship defines who belongs to the political community and therefore possesses full rights and responsibilities within a state. Citizenship is typically acquired through birth (jus soli or jus sanguinis), naturalization, or state grant, and can be revoked or renounced. The boundaries of citizenship determine who can vote, hold office, access welfare, and enjoy full legal protection. Immigration, transnational movement, and diaspora communities challenge traditional exclusive citizenship models, raising questions about dual citizenship, guest workers' rights, and whether political membership must be tied to territorial presence.

Explainer

Your work on state concept and sovereignty established that a state claims supreme authority over a defined territory and population. Citizenship is the mechanism that answers the question: who is "the population"? It is the boundary condition of political membership — the line that determines who is fully inside the political community, entitled to its protections and subject to its obligations, and who stands outside it. Getting citizenship right conceptually matters because it is where territorial sovereignty, individual rights, and questions of democratic legitimacy all intersect.

Two foundational principles govern how citizenship is acquired by birth. Jus soli (right of the soil) grants citizenship to anyone born on a state's territory, regardless of parentage — the principle used by the United States and most of the Americas, a legacy of New World immigration contexts. Jus sanguinis (right of blood) grants citizenship based on descent — if one or both parents are citizens, the child inherits citizenship regardless of birthplace — the dominant principle in European and East Asian states with older ethnonational traditions. Most contemporary states use a combination, but the default principle shapes who belongs from birth. Germany's 2000 citizenship reform, which added limited jus soli elements to a historically jus sanguinis system, is a telling example of how these principles are politically contested rather than simply technical.

Beyond birth, naturalization is the process by which non-citizens acquire membership through residency, language acquisition, civic knowledge tests, and formal legal procedures. Naturalization requirements vary enormously: some states require years of residence and extensive integration criteria; others offer expedited paths for ethnic diaspora members. The naturalization process encodes assumptions about what citizenship means — whether it is primarily a legal-administrative status, a cultural assimilation, or a civic commitment. Dual citizenship, once rare and often prohibited (the intuition being that divided loyalty was incompatible with sovereign membership), has expanded dramatically as transnational migration has become more common. Today, more than half of the world's states permit or tolerate dual citizenship.

The deepest contemporary challenge to classical citizenship theory is the mass presence of non-citizen residents: guest workers, undocumented migrants, long-term permanent residents, and refugees who live and work within a state's territory but lack full membership rights. T.H. Marshall's influential analysis of citizenship described its expansion through three historical stages — civil rights, political rights, and social rights — but this trajectory assumed a simple citizen/alien binary that no longer holds. The German *Gastarbeiter* (guest worker) who arrived in the 1960s and raised children in Germany, or the undocumented migrant who has lived in the U.S. for decades, occupies a juridical gray zone: subject to state authority, contributing to the economy, but excluded from the full bundle of rights citizenship provides. This gap between territorial presence and political membership is one of the central tensions in contemporary democratic theory.