Chae Chan Ping v. United States
The Court upheld a 1888 federal law that barred Chinese laborers from re-entering the United States, even those who had left the country holding government-issued certificates promising them the right to return.
The ruling established that Congress can override treaty promises to a foreign nation and can exclude any class of foreigners it chooses, because controlling who enters the country is treated as a core part of national sovereignty that courts will not second-guess.
“The jurisdiction of the nation within its own territory is necessarily exclusive and absolute.”
Quoting Chief Justice Marshall on why a nation can control who enters its territory.
How it got here: A lower federal court rejected the laborer's challenge to the 1888 exclusion law, and he appealed that ruling to the Supreme Court.
The Case in Depth
What happened
Under earlier treaties and an 1882 law (as amended in 1884), Chinese laborers already living in the U.S. before November 1880 could leave and return using a government certificate proving their prior residence. A Chinese laborer who left the U.S. holding such a certificate sought to re-enter after Congress passed a new 1888 law voiding all such certificates and barring re-entry outright.
The question before the Court
Could Congress bar a Chinese laborer from returning to the United States even though he held a certificate promising he could come back?
Why it matters
Thousands of Chinese laborers who had left the U.S. temporarily, relying on government certificates guaranteeing their return, were permanently barred from coming back. The decision gave Congress broad, court-unreviewable power to exclude any group of foreigners regardless of existing treaties, a principle that shaped American immigration law for generations.
What changes now
This was a final merits ruling, not subject to further proceedings below beyond affirming the lower court. Chinese laborers holding return certificates, including the appellant, were permanently barred from re-entering the United States under the 1888 law. The decision left any dispute over the broken treaty promises to diplomatic channels between the U.S. and Chinese governments, not the courts, and became a foundational precedent for later exclusion and immigration laws.
What this does not decide
The Court did not decide whether Congress was wise, fair, or diplomatically justified in breaking its treaty promises to China — it said that question belonged to the political branches, not the judiciary, and it expressly declined to judge the motives behind the law.
How the Court got there
The legal reasoning, step by step
- The Court first asked whether the 1888 law conflicted with existing treaties between the U.S. and China, and concluded that it did — the law plainly contradicted promises made in the 1868 and 1880 treaties allowing Chinese laborers to come and go freely.
- The Court then held that a conflict with a treaty does not make a later act of Congress invalid, because the Constitution gives treaties and federal statutes equal legal footing; when the two conflict, whichever came later in time controls, so a treaty can be modified or overridden by a subsequent act of Congress.
- Because the 1888 law came after the treaties, the Court treated it as effectively superseding the treaty promises as a matter of domestic law, leaving any complaint about the broken promise to be resolved between the two nations' governments, not the courts.
- The Court then turned to whether Congress had the underlying power to exclude Chinese laborers at all, reasoning that excluding foreigners from a nation's territory is an inherent part of national sovereignty and independence, not dependent on any treaty for its existence.
- The Court reasoned that this exclusion power belongs to the political branches and its exercise — including who to exclude and why — is not a question courts can review, so long as Congress acted within its general authority over foreign affairs.
- Applying this, the Court concluded that any certificate or permission previously granted to Chinese laborers to return was merely a revocable privilege, not a vested property right, so Congress could cancel it at will without violating any judicially enforceable right of the laborer.
Doctrinal impact
Cases affected by this decision
Reaffirms The Head Money Cases (112 U.S. 580)
Relied on to confirm that Congress can modify or repeal treaty obligations through later legislation.
Reaffirms Whitney v. Robertson (124 U.S. 190)
Cited as settled law that courts must follow a later statute even if it conflicts with an earlier treaty.