Postfunctionalism across the Atlantic: The “New Politics” in European Integration and US Federalism

The European Union’s internal market was modeled in part on the United States’ national market, yet public attitudes toward market governance in the two arenas have long been understood through different theoretical lenses. In this article, we apply the postfunctionalist theory of European integration—developed to explain EU citizens’ attitudes toward supranational authority—to American federalism, testing whether cultural identity divides (GAL/TAN) shape public opinion on central market governance in the United States as they do in Europe. Using an original survey of 16,000 respondents across eight EU countries and 4,000 Americans, we find that postfunctionalist dynamics are robust in both contexts, challenging prevailing views that American attitudes toward federalism are driven primarily by Left–Right ideology or material interests. Our findings suggest that identity-based contestation over governance extends beyond the EU’s nation-state politics, requiring a broader theoretical framework to understand the intersection of culture, federalism, and economic integration across advanced democracies.