---
title: "Zschernig v. Miller | Constitutional Law I"
description: "Zschernig v. Miller is the case striking down an Oregon inheritance law because states cannot intrude on federal foreign affairs power in Constitutional Law I."
canonical: "https://fiveable.me/constitutional-law-i/key-terms/zschernig-v-miller"
type: "key-term"
subject: "Constitutional Law I"
unit: "Unit 13"
---

# Zschernig v. Miller | Constitutional Law I

## Definition

Zschernig v. Miller is the 1968 Supreme Court case holding that states cannot use laws affecting foreign nationals in ways that interfere with federal foreign affairs power. It is a major Constitutional Law I example of state limits in international relations.

## What It Is

Zschernig v. Miller is a Constitutional Law I case about how far a state can go when its law touches foreign affairs. The Supreme Court struck down an Oregon inheritance rule that made it harder for noncitizens and foreign heirs to receive property, because the law did more than manage probate. It invited state officials to judge the policies and governments of other countries, which the Court saw as a problem for national foreign relations.

The big idea is that foreign affairs are not just another area where states can experiment. Even when a state says it is dealing with local property law, the practical effect can be to send a message about a foreign nation or to pressure that nation’s conduct. Zschernig treats that kind of state involvement as constitutionally suspect because the federal government needs one voice abroad, not fifty separate ones.

This case is often discussed as part of the Court’s broader foreign affairs doctrine. That doctrine says the Constitution gives the national government the central role in diplomacy, treaties, recognition, and other external relations. States can still run ordinary domestic programs, but they cannot create policies that poke into international relations or undercut federal choices.

What made Zschernig especially interesting is that the Oregon law was not a treaty conflict in the obvious sense. The Court still invalidated it because of its “impact” on foreign affairs. That makes the case useful for spotting laws that look local on paper but become constitutional problems when they force state actors to evaluate foreign governments, retaliate against them, or interfere with the country’s diplomatic posture.

In class, you can think of Zschernig as a warning sign. If a state rule about inheritance, contracts, property, or licensing starts changing how the United States appears to foreign countries, the analysis may shift from ordinary state power to foreign affairs preemption and federal supremacy.

## Why It Matters

Zschernig v. Miller matters because it gives Constitutional Law I students a clean example of the line between state authority and the federal government’s control over foreign affairs. It is not just about inheritance law. It shows how a state statute can become unconstitutional even without a direct clash with a federal treaty or statute, simply because it intrudes into an area the Constitution reserves for national management.

That matters for class discussions about federalism because foreign affairs are one of the strongest examples of implied limits on state power. You learn that federal supremacy is not only about clear statutory conflict. Sometimes the Court looks at the practical effect of a state law and asks whether it sends the wrong diplomatic signal or interferes with the country’s ability to speak with one voice.

It also gives you a tool for reading later cases. When you see a state law affecting foreign nationals, sanctions, boycotts, property rights, or business dealings with other countries, Zschernig helps you ask the right question: is this really local regulation, or is it state-level foreign policy? That question is central in foreign affairs cases and often decides the outcome.

The case also helps separate ordinary state police powers from constitutional limits. States usually can regulate inheritance and property, but Zschernig shows that subject matter alone does not end the analysis. The context and effects of the law matter too.

## Connections

### Supremacy Clause

Zschernig is a good example of why federal law and federal constitutional authority can override state rules. Even though Oregon was acting in an area it normally controls, the Court treated the foreign affairs impact as a federal concern. That fits the Supremacy Clause idea that states cannot keep a law in place when it conflicts with superior national authority.

### Foreign Affairs

This case sits inside the foreign affairs doctrine. It shows that foreign relations are not just about presidents, treaties, and ambassadors. A state inheritance rule can become a foreign affairs problem if it pressures other governments or changes how the U.S. appears internationally.

### Preemption

Zschernig is often taught alongside preemption because it raises the same basic question, who gets the final say. The twist is that the Court did not rely on a direct federal statute displacing Oregon law. Instead, it treated the state rule as invalid because it entered a field where federal authority is exclusive or highly dominant.

### [Zivotofsky v. Kerry](/constitutional-law-i/key-terms/zivotofsky-v-kerry)

Both cases deal with who speaks for the United States in external affairs. Zschernig focuses on state interference with foreign policy, while Zivotofsky deals with the federal government’s own recognition power. Together they help show that the Court protects a unified national voice in different ways.

## On the AP Exam

A case ID question or short essay may ask you to spot a state law that looks domestic but affects foreign relations. Use Zschernig to argue that the law is unconstitutional if it forces state officials to evaluate foreign governments, pressures diplomacy, or creates a state foreign policy of its own. In a rule-application answer, mention that the Court cared about the law’s practical effect, not just its label.

If you get a comparison prompt, pair Zschernig with Supremacy Clause and foreign affairs doctrine language. The move is to say that the state still has ordinary probate power, but that power stops when the law becomes a tool for international signaling or diplomatic pressure. On a quiz or class discussion, be ready to explain why the case is not just about inheritance, it is about federal control over the nation’s external voice.

## Zschernig v. Miller vs Preemption

Both ideas deal with state law giving way to federal authority, but they are not identical. Preemption usually means a federal statute, treaty, or regulation displaces a state rule. Zschernig is often taught as a foreign affairs case where the Court invalidated a state law because of its intrusion into an area reserved for national control, even without a direct federal law conflict.

## Key Takeaways

- Zschernig v. Miller is a Supreme Court case from 1968 that struck down an Oregon inheritance law because it interfered with federal foreign affairs power.
- The case shows that a state law can be unconstitutional even if it looks local, if its effect reaches into diplomacy or foreign relations.
- The Court cared about the practical impact of the law, especially whether it encouraged state officials to judge foreign governments.
- Zschernig is a major federalism case because it shows how the Constitution limits state power when the national government needs one voice abroad.
- You can use this case to spot laws that seem about property, but actually function like state foreign policy.

## FAQs

### What is Zschernig v. Miller in Constitutional Law I?

Zschernig v. Miller is the 1968 Supreme Court case that struck down an Oregon inheritance law because it interfered with federal authority over foreign affairs. In Constitutional Law I, it is a major example of how state laws can be invalid even when they seem local on the surface.

### Why did the Supreme Court strike down the Oregon law in Zschernig v. Miller?

The Court thought the law did more than regulate inheritance. It encouraged state officials to examine the behavior and policies of foreign governments, which threatened a unified national approach to foreign relations.

### Is Zschernig v. Miller the same thing as preemption?

Not exactly. Preemption usually means a federal law or treaty directly displaces a state law, while Zschernig is often taught as a foreign affairs case where the state law was invalid because of its intrusion into an area reserved for the federal government. They overlap, but the doctrine is not identical.

### How do I use Zschernig v. Miller in a Constitutional Law I essay?

Use it when a state law touches foreign nationals, treaties, sanctions, or diplomatic relations in a way that goes beyond normal state regulation. The strongest argument is that the state is making foreign policy by accident or design, and the Constitution leaves that role to the national government.

## Related Study Guides

- [13.3 Federalism Concerns in Foreign Affairs](/constitutional-law-i/unit-13/federalism-concerns-foreign-affairs/study-guide/5HCvTNABYJb7SXdI)

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