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Do duties of justice stop at the border of one's own state, or do they extend to every human being? This question has driven the subfield of global justice since its emergence in the mid-twentieth century. Ten competing frameworks have developed in response, each offering a different account of what we owe to distant strangers, why we owe it, and through which institutions those obligations should be realized. The frameworks have not simply replaced one another; they coexist, challenge, and sometimes absorb elements from their rivals, leaving the field deeply pluralistic today.
The first framework to shape the debate was Realism, which emerged in the 1940s and remains a persistent minority voice. Realists argue that international politics is a domain of power and self-interest, not moral principle. States act to advance their own security and interests, and any talk of global justice is either naive or a mask for great-power ambitions. This skepticism provided the foil against which all later normative frameworks defined themselves.
In direct opposition, the Human Rights Framework took institutional form with the Universal Declaration of Human Rights in 1948. Rather than treating moral claims as irrelevant, this framework holds that every person possesses basic rights—to life, liberty, security, and subsistence—that all states and international bodies must respect. The Human Rights Framework established a minimal threshold: an injustice occurs when a state or global arrangement fails to meet this standard. It did not demand equality across borders, but it did insist that sovereignty does not shield states from accountability for the worst deprivations. Realism and the Human Rights Framework thus set the initial terms: one side denying that moral principles apply internationally, the other insisting on a universal floor.
The 1970s saw the subfield's central axis take shape. Cosmopolitanism extended the logic of universal concern far beyond minimal rights. Cosmopolitans argue that every human being has equal moral worth, and that this equal worth generates duties of justice that cross state boundaries. Peter Singer's 1972 argument that affluent people are morally obligated to prevent famine deaths, even at great distance, exemplified the cosmopolitan demand: if we can prevent something bad without sacrificing anything comparable, we must do so. Later cosmopolitans like Charles Beitz and Thomas Pogge argued that global economic institutions create a basic structure analogous to the domestic one, and that this structure must be assessed by principles of distributive justice. Cosmopolitanism is internally diverse: some demand only that everyone's basic needs be met, while others insist on global equality of opportunity or resources.
Statism emerged in the same decade as a direct counterweight. Statists hold that principles of distributive justice apply only within a state, because the state is a coercive institutional scheme that generates special obligations among its members. John Rawls's The Law of Peoples (1999) became the flagship statist statement: peoples, not individuals, are the subjects of international justice, and the duty of well-ordered societies is to assist burdened societies in becoming well-ordered themselves, not to redistribute resources globally. Michael Blake and Thomas Nagel later developed versions of statism grounded in the idea that coercion requires justification, and that only co-citizens stand in a relation of shared coercion that triggers egalitarian demands. The core disagreement between Cosmopolitanism and Statism is not about whether we have any duties to foreigners—both sides accept some duties—but about whether those duties include the full range of distributive justice or are limited to assistance, non-harm, and basic rights.
By the 1980s, philosophers began to search for positions that could capture the appeal of both cosmopolitan universalism and statist particularism. Nationalism offered one such path. Nationalists like David Miller argue that national communities are ethically significant: shared culture, history, and identity generate special obligations among co-nationals that are stronger than duties to outsiders. Nationalism does not deny that we have some duties to foreigners, but it insists that those duties are less demanding than what we owe to fellow citizens. This placed Nationalism between Cosmopolitanism and Statism: it agreed with Statism that special ties matter, but it grounded those ties in cultural belonging rather than institutional coercion, and it left room for humanitarian duties across borders.
The Capabilities Approach, developed by Amartya Sen and Martha Nussbaum in the 1980s, shifted the debate from what people have to what they can actually do and be. Instead of measuring justice by resources, utility, or rights, the Capabilities Approach asks whether people have the genuine freedom to achieve valuable functionings—being adequately nourished, participating in political life, moving freely, and so on. This framework challenged both Cosmopolitanism and Statism by changing the metric of justice. For global justice, the Capabilities Approach implies that the goal of international institutions and policies should be to expand people's capabilities, not merely to transfer resources or respect formal rights. Nussbaum explicitly argued for a list of central capabilities that all governments must secure for their citizens, making the approach a cosmopolitan one in practice, though Sen remained more cautious about specifying a single list.
The 1990s brought a wave of new frameworks that radicalized, moderated, or challenged the existing debate from different angles.
Global Egalitarianism pushed Cosmopolitanism to its most demanding conclusion. While earlier cosmopolitans often focused on meeting basic needs or preventing severe poverty, Global Egalitarians like Darrel Moellendorf and Simon Caney argue that global justice requires equality—of opportunity, of resources, or of some other distributive currency—across all persons regardless of nationality. This framework directly confronts Statism: if all persons have equal moral worth, why should a person's place of birth determine their life prospects? Global Egalitarianism remains a minority position even among cosmopolitans, but it has forced defenders of Statism to explain why inequality across borders is not unjust.
Sufficientarianism emerged as a direct rival to egalitarian demands. Sufficientarians argue that what matters is not equality but whether everyone has enough—a threshold of sufficiency below which no one should fall. This framework can accommodate both cosmopolitan and statist intuitions: one can be a cosmopolitan sufficientarian who demands that all persons reach the threshold, or a statist sufficientarian who holds that the threshold is the only global duty. Sufficientarianism thus offers a way to avoid the demandingness of Global Egalitarianism while still taking global poverty seriously. Its main challenge is specifying where the threshold lies and why falling below it is unjust while inequality above it is not.
Feminist Critique entered the global justice debate in the 1990s by questioning the assumptions of both Cosmopolitanism and Statism. Feminist philosophers like Iris Marion Young and Martha Nussbaum (whose Capabilities Approach was partly motivated by feminist concerns) argued that mainstream frameworks ignored gender-based injustices—the disproportionate burden of poverty on women, the exclusion of women from political participation, and the role of patriarchal structures in perpetuating global inequality. Feminist Critique does not simply add gender to existing frameworks; it challenges the very categories of the debate, such as the public-private distinction that hides domestic violence and unpaid labor from the scope of justice. It also insists that global justice must attend to structural oppression, not just distribution.
Postcolonial Critique went further, questioning the Eurocentrism of the entire global justice project. Postcolonial theorists like Dipesh Chakrabarty and Leela Gandhi argue that the frameworks of Cosmopolitanism, Statism, and Human Rights are products of Western political thought that impose universal categories on non-Western contexts. The very idea of global justice, they contend, can be a tool of neocolonial domination if it ignores the history of colonialism, imperialism, and ongoing economic exploitation. Postcolonial Critique does not offer a single alternative framework; instead, it demands that any adequate theory of global justice must be self-aware about its own cultural and historical location, and must take seriously the perspectives of those who have been marginalized by global institutions. This framework has pushed the subfield to engage with non-Western traditions and to question whether the terms of the debate are themselves part of the problem.
Today, the subfield of global justice remains deeply contested. The Cosmopolitanism-Statism axis still dominates, with most philosophers positioning themselves somewhere along that spectrum. Cosmopolitanism leads in terms of sheer volume of work and its influence on human rights discourse, international law, and development policy. Statism retains a strong presence, especially among philosophers who take the state's coercive role as the starting point for justice. The two frameworks agree that we have some duties to foreigners, but they disagree fundamentally about whether those duties include egalitarian distribution or are limited to ensuring basic decency.
Nationalism and the Capabilities Approach continue as active alternatives, each offering a distinctive way to balance universal concern with particular attachments. Global Egalitarianism and Sufficientarianism remain in live disagreement: egalitarians argue that inequality itself is unjust, while sufficientarians insist that only absolute deprivation matters. Feminist Critique and Postcolonial Critique have permanently reshaped the field by exposing the gender and cultural biases of earlier frameworks, though they have not yet produced a single dominant alternative.
The unresolved tensions that drive ongoing debate include: whether duties of justice require shared institutions or can be discharged by individuals and non-state actors; whether the metric of justice should be resources, capabilities, or something else; whether the history of colonialism generates special reparative duties; and whether the very concept of global justice is a form of Western universalism that needs to be provincialized. These questions ensure that global justice remains a vibrant and pluralistic subfield, with no single framework likely to achieve consensus.