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Judicial review—the power of courts to strike down legislation as unconstitutional—has always posed a legitimacy puzzle. By what authority do unelected judges override the decisions of democratically elected legislatures? And how should they interpret the constitution when doing so? Over two centuries, competing theoretical frameworks have offered rival answers, each responding to the perceived weaknesses of its predecessors and to shifting assumptions about law, democracy, and judicial competence.
The earliest systematic justifications for judicial review drew on Natural Law Constitutionalism. In this view, the constitution embodied fundamental moral principles that transcended ordinary legislation. Judges, when striking down a statute, were not overriding popular will but enforcing a higher law that the people themselves had adopted. The landmark case Marbury v. Madison (1803) grounded judicial review in the written constitution's supremacy, but natural law thinkers read that document as a repository of objective moral truths. This framework gave judges a robust role but left open the question of how to identify those truths without simply imposing personal values.
Legal Formalism emerged alongside natural law constitutionalism and shared its confidence in determinate legal answers. Formalists argued that judicial review was a logical deduction from the constitution's text and structure. A judge, by applying neutral rules of interpretation, could reach the one correct outcome without resorting to policy preferences. The formalist judge was a kind of legal mathematician, deducing results from premises. This approach dominated American constitutional thought through the early twentieth century, but its claim to mechanical objectivity came under increasing strain as judges confronted ambiguous provisions and conflicting precedents.
Legal Realism attacked the formalist edifice at its foundation. Realists argued that legal rules were radically indeterminate: the same set of facts could support opposite conclusions depending on which rule a judge chose to apply. Judicial decisions, they insisted, were driven by the judge's background, psychology, and policy intuitions, not by logical deduction from text. This critique, crystallized in the work of American legal realists in the 1920s–1940s, created a legitimacy crisis for judicial review. If judges were simply legislating from the bench, what justified their power over democratic majorities?
Legal Process Theory, developed in the 1950s by scholars such as Henry Hart and Albert Sacks, offered a response that shifted the source of legitimacy from rule-content to decision-procedure. The key was not that judges reached the right substantive answer, but that they followed the right institutional process. Courts, the theory held, were institutionally competent to decide certain kinds of questions (especially those involving reasoned elaboration of principle) and should defer to legislatures on others. Legal Process Theory preserved judicial review by narrowing its domain: courts should enforce only those constitutional norms that could be derived through a distinctive mode of reasoned argument, leaving policy choices to the political branches. This framework dominated American constitutional scholarship through the 1970s, but its reliance on a consensus about institutional roles began to fray as political polarization deepened.
The 1970s saw a sharp turn toward interpretive method as the central battleground of judicial review theory. Living Constitutionalism argued that the constitution's meaning evolves over time, adapting to new circumstances and societal values. Drawing on the realist insight that text alone cannot settle hard cases, living constitutionalists maintained that judges should interpret broad phrases like "due process" or "cruel and unusual punishment" in light of contemporary standards. This approach justified landmark decisions such as Brown v. Board of Education (1954) and Roe v. Wade (1973) as legitimate updates of constitutional meaning. Its critics, however, charged that it gave judges unchecked discretion to read their own values into the constitution.
Originalism emerged in direct opposition to living constitutionalism. Originalists argued that the constitution's meaning was fixed at the time of its adoption. Judges, they insisted, should enforce only that original meaning—whether understood as the framers' intent or, in a later refinement, the original public meaning of the text. Originalism promised to constrain judicial discretion and restore democratic accountability: if the constitution's meaning is stable, then amendments must come through the Article V process, not through judicial reinterpretation. The framework has evolved internally, with early originalist focus on subjective intent giving way to the more textually oriented original public meaning approach championed by Justice Antonin Scalia and others. Today, originalism remains a major force in American constitutional theory, coexisting in live disagreement with living constitutionalism. The two frameworks share a common starting point—the realist recognition that text alone is indeterminate—but diverge sharply on whether that indeterminacy should be resolved by reference to contemporary values or historical meaning.
While the interpretive turn dominated mainstream debate, a parallel set of critical frameworks challenged the very terms of that debate. Critical Legal Studies (CLS), emerging in the 1970s, radicalized the realist indeterminacy thesis. CLS scholars argued that law was not merely indeterminate but deeply ideological: legal rules and reasoning systematically served to legitimize existing power structures. Judicial review, in this view, was a tool of elite domination, not a neutral arbiter of constitutional meaning. CLS offered a thoroughgoing critique but struggled to provide a constructive alternative, leading some to dismiss it as purely negative.
Critical Race Constitutionalism and Feminist Constitutionalism, both emerging in the 1980s, shared CLS's skepticism of legal neutrality but focused on specific hierarchies of race and gender. Critical race theorists argued that constitutional law had historically perpetuated white supremacy, from the original compromise over slavery to modern colorblindness doctrines that ignored structural inequality. Feminist constitutionalists similarly exposed how constitutional doctrines—from privacy to equal protection—had been shaped by patriarchal assumptions. Both frameworks insisted that judicial review could not be understood apart from the social identities of judges and litigants. They overlapped with CLS in methodology but diverged in their attention to particular forms of subordination and in their willingness to engage with legal reform as a site of struggle. Today, critical race and feminist constitutionalism remain active scholarly traditions, influencing how courts and scholars analyze issues from voting rights to reproductive justice.
By the 1990s, the traditional model of judicial review—a single supreme court interpreting a national constitution—faced challenges from two directions. Constitutional Pluralism questioned the assumption of hierarchical legal authority. In contexts like the European Union, multiple constitutional orders (national, supranational, international) claimed ultimate authority, and no single court could resolve conflicts between them. Pluralists argued that judicial review should be reconceived as a dialogue among overlapping legal systems, with courts negotiating rather than commanding. This framework directly challenged the monist assumptions of earlier theories, which had taken the nation-state's constitutional supremacy for granted.
Global Constitutionalism went further, arguing that constitutional norms were emerging beyond the state altogether. International human rights treaties, transnational judicial networks, and the spread of constitutional courts around the world suggested a global constitutional order in the making. Global constitutionalists studied how courts in different countries cited each other's decisions, how international law constrained domestic legislation, and how judicial review was becoming a global practice. This framework coexists with constitutional pluralism, but where pluralism emphasizes fragmentation and contestation, global constitutionalism emphasizes convergence and shared norms. Both have expanded the subfield's focus beyond the United States, making comparative and international dimensions central to contemporary judicial review theory.
The most recent major framework, Common Good Constitutionalism, emerged in the 2010s as a self-conscious alternative to both originalism and living constitutionalism. Its proponents, led by scholar Adrian Vermeule, argue that the constitution should be interpreted to promote the common good—understood in terms of classical natural law principles of justice, peace, and flourishing. Common good constitutionalism rejects the originalist claim that meaning is fixed at ratification, but also rejects the living constitutionalist claim that meaning evolves with popular values. Instead, it insists that constitutional interpretation should be guided by substantive moral reasoning about what a well-ordered society requires. This framework revives elements of natural law constitutionalism while engaging with modern debates about administrative power and executive authority. It has generated intense controversy, with critics charging that it would license judges to impose a particular religious or political vision. Common good constitutionalism remains a minority position but has sparked a vigorous debate about the proper role of moral reasoning in constitutional adjudication.
No single framework has achieved dominance. Originalism and living constitutionalism remain the two poles of American interpretive debate, each with sophisticated internal variants and a large scholarly following. Critical race and feminist constitutionalism continue to shape how courts and scholars understand equality and liberty. Constitutional pluralism and global constitutionalism have opened new questions about the boundaries of constitutional authority. Common good constitutionalism, though newer, has forced a reexamination of the relationship between law and morality. What these frameworks agree on is that judicial review cannot be justified by mechanical rule-application alone; some theory of interpretation, institutional role, or substantive value is necessary. Where they disagree is on the source of that justification—whether it lies in original meaning, evolving standards, critical social analysis, or moral truth. This pluralism is not a sign of weakness but a reflection of the enduring complexity of the question that launched the subfield: by what right do judges bind the people to a constitution they must interpret?