Here are the still valid legal principles from Chae Chan Ping v. United States (The Chinese Exclusion Case, 130 U.S. 581, 1889):
Congress Has Complete Power Over Immigration: The U.S. Congress has full control over immigration laws. This means Congress can decide who can enter or stay in the U.S. This power is part of the U.S. government’s authority as an independent nation, and courts usually won’t interfere with immigration decisions made by Congress.
The Right to Control Immigration Is Part of National Sovereignty: Like every independent country, the U.S. has the right to decide who can come in and who must stay out. The government can exclude anyone from the country if it believes their presence could harm the nation’s security or interests.
Congressional Laws Can Override Treaties: Treaties made between the U.S. and other countries can be changed or canceled by laws passed by Congress. If Congress passes a law that conflicts with an earlier treaty, the law will take priority, even if it means breaking an agreement made with another country.
Personal Rights Under Treaties Can Be Revoked: Some rights, like a foreigner’s right to return to the U.S. with a certificate, can be taken away by Congress if they pass a new law. However, rights related to property that are protected by a treaty, such as owning land, are not automatically canceled if a treaty is revoked.
Congress Has the Authority to Exclude Aliens: The U.S. government, through Congress, has the legal authority to stop foreigners from entering the country. This power was used to uphold laws like the Chinese Exclusion Act, which blocked certain immigrants from re-entering the U.S., even if older laws or treaties suggested they could return.
These legal principles are still relevant today and continue to shape U.S. immigration policies, emphasizing that Congress has broad authority over who can enter or stay in the country.


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