Fifty Sovereigns: How State Attorneys General Are Quietly Rewriting the Rules of American Diplomacy

For most of American history, the conduct of foreign affairs was understood to be the exclusive province of the federal government. The Constitution is explicit on the matter — treaties are ratified by the Senate, ambassadors are appointed by the president, and the power to recognize foreign states rests with the executive branch alone. That architecture, designed by men who had just survived a war and a failed confederacy, was built to ensure that the United States spoke to the world with a single, coherent voice.

That architecture is now under significant strain.

Over the past decade, and with accelerating intensity during both the Biden and Trump administrations, state attorneys general have begun operating in spaces that once belonged exclusively to the State Department. They are signing memoranda of understanding with foreign provincial governments. They are issuing sanctions-style enforcement actions against overseas corporations. They are negotiating directly with European regulators on data privacy standards, coordinating with Canadian counterparts on environmental enforcement, and publicly condemning the human rights records of foreign nations in language that would not be out of place in a diplomatic communiqué.

This is not incidental. It is a pattern — and it is reshaping what American foreign policy actually looks like on the ground.

The New Diplomats in the State Capitol

The transformation did not happen overnight, nor did it emerge from a single ideological direction. Republican attorneys general led the charge in some areas, particularly in pushing back against international climate agreements they viewed as economically harmful to their states' energy industries. Democratic attorneys general moved aggressively in others, most notably in the realm of data privacy, where the absence of federal regulation left states to negotiate de facto compliance frameworks with European Union authorities on their own.

California's attorney general office has, in practical terms, become a regulatory counterpart to Brussels. The California Consumer Privacy Act and its successor legislation have forced multinational corporations to treat the state's legal posture as a global standard-setter — a dynamic that European regulators have actively encouraged. When California's AG issues guidance on data practices, technology companies operating across Europe take notice, because the compliance costs of divergence are simply too high.

Texas and several other states have moved in a different direction, targeting foreign entities — particularly Chinese technology firms and state-affiliated investors — through a combination of litigation, legislative action, and public enforcement campaigns that carry unmistakable diplomatic overtones. When a Texas attorney general announces an investigation into a company with direct ties to the Chinese Communist Party, the action is simultaneously a legal proceeding and a foreign policy statement.

When Enforcement Becomes Statecraft

The line between legal enforcement and diplomatic signaling has always been somewhat porous. What is new is the deliberateness with which some state AGs are exploiting that porosity.

Several states have enacted laws allowing their attorneys general to pursue civil penalties against foreign government-linked entities for actions taken abroad — a legal theory that would have seemed exotic two decades ago. Others have signed bilateral agreements with sub-national governments in Canada, Mexico, and the European Union on issues ranging from wildfire management to pharmaceutical pricing transparency. These agreements are not treaties in the constitutional sense, but they function as durable, enforceable commitments that bind state agencies and, in some cases, private parties operating within those states.

Foreign governments have noticed. Canadian provincial officials have quietly expressed frustration at having to maintain parallel relationships with Washington and with individual state capitals — particularly on cross-border infrastructure and environmental issues where state-level enforcement powers can effectively override federal permitting decisions. European trade officials have been more pragmatic, treating state-level engagement as a useful hedge against the volatility of federal administrations that change direction every four years.

That pragmatism, however, creates its own complications. When a European regulator negotiates a data-sharing framework with a coalition of Democratic state AGs, and a subsequent Republican federal administration adopts a contradictory policy, the result is not clarity — it is a layered, often incomprehensible patchwork of obligations that multinational firms must navigate at considerable expense.

The Constitutional Ambiguity at the Center

Scholars who study the intersection of federalism and foreign affairs have been sounding alarms about this trend for years, though their warnings have rarely penetrated the political mainstream. The constitutional doctrine governing state involvement in foreign affairs — rooted in the Supremacy Clause and the so-called dormant foreign affairs preemption doctrine — is notoriously unclear. The Supreme Court has struck down some state-level foreign policy initiatives as unconstitutional intrusions on federal authority, but it has also left enormous room for state action in areas where Congress has not spoken definitively.

That silence from Congress has become an invitation. On issues like data privacy, pharmaceutical supply chains, foreign real estate investment, and environmental enforcement, federal inaction over the past two decades has created regulatory vacuums that state attorneys general have rushed to fill. From their perspective, the choice is not between state action and federal action — it is between state action and no action at all.

Critics, including a growing number of former State Department officials from both parties, argue that this framing obscures serious risks. When individual states issue what amount to sanctions against foreign entities, they are making judgments about foreign policy that can affect American national interests in ways that extend far beyond their borders. A state AG who targets a foreign company for political purposes — or who signs a climate agreement that implicitly condemns a trading partner's energy policy — is not merely exercising local authority. They are shaping how the United States is perceived abroad, without any of the accountability mechanisms that govern federal diplomacy.

Healthy Experimentation or Structural Chaos?

The debate over state-level foreign engagement ultimately reduces to a question about the nature of American federalism in the 21st century. Those who view the trend favorably argue that the states have always been laboratories of democracy, and that their growing international role reflects a healthy adaptation to a world in which the most consequential policy challenges — climate, data governance, supply chain security — do not respect the boundaries between domestic and foreign affairs.

Those who view it with alarm point to the obvious: the United States is not a confederation of fifty sovereign republics. It is a single nation that negotiates from a position of strength precisely because it can present a unified position. Every time a state attorney general freelances on the international stage, that unity is fractured, and the leverage it provides is diminished.

Both arguments contain genuine force. What neither side has fully reckoned with is that the trend is unlikely to reverse itself absent a dramatic expansion of federal regulatory capacity in areas where Washington has long been paralyzed. State attorneys general are not filling a void they created. They are filling a void that Congress, across multiple administrations and both parties, has repeatedly declined to address.

In that sense, the fifty sovereigns now practicing their own foreign policy are less a symptom of institutional ambition than of institutional failure. The question for the next generation of American governance is not whether states will continue to engage internationally — they will — but whether the federal government will eventually build the frameworks necessary to coordinate that engagement into something coherent. The world is watching, even if Washington is not.