I suppose congress could pass a bill that defines
what the phrase “subject to the jurisdiction thereof” means.
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http://www.federalistblog.us/2007/09/revisiting_subject_to_the_jurisdiction/
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“...children born to parents who owed no foreign allegiance,
not merely those born within its limits, were to be citizens of the United States...”
Back in 1897, a bill to define PI as 3.2 came before the Indiana legislature.
It didn't pass. But if it had, it would not have changed PI.
Nor can today's Congress redefine "subject to the jurisdiction" as it was used in the 14th.