It does not give to either a paramount authority over the other. So far as a treaty operates by its own force without legislation. it is to be regarded by the courts as equivalent to a legislative act. but nothing further. If the subject to which it relates be one upon which Congress call also act. that body may modify its provisions or superscd them entirely. The immigration of foreigners to the United States and the conditions upon which they shall be permitted to remain are appropriate subjects of legislation as well as of treaty stipulation. No treaty can deprive Congress of its power in that respect. As said by Mr.
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immigration