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You, as a "US citizen" voluntarily legally agreed to the laws that bind your conduct. You are an indentured slave by choice and consent. The immigrant has not consented to the same legal jurisdiction that binds you, therefore the immigrant is still sovereign until and unless they consent in some form to legal jurisdiction. That is the difference. You are a government slave. The immigrant isn't. Yet. But they can't wait to be and come here just to be a slave too.

Stop thinking like a slave and start thinking like a lawyer. You'll find that the answers to many questions like yours become quite obvious.