I think that when it comes to immigration and birthright citizenship, I feel that the process should be formalized and designed to prevent anchor babies.
At the time of birth, the baby receives the remaining time the mother has to possessing her own citizenship. If she has a year left to receive hers, the baby gets their own within a year. If the immigrant mother already has citizenship, so does the kid.
All adopted children and immigrants automatically begin incrementing their citizenship automatically while staying on US soil, the ticker to eligibility pausing if they don't reside within the nation. Once the amount of required time has passed, the immigrant/child can decide whether to accept citizenship. The nation can't refuse granting citizenship.
Citizenship offers full Universal Income while jobless and the ability to vote for political elections, but immigrants can still vote on their workplace policies and leadership. Criminals can still earn citizenship automatically, and any task they do within prison, still counts as a full fledged job.
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This is part of my Universal Living concept, which has Universal Income, Universal Services, and Universal Ranked Income. Citizenship is 20 years automatically, the time reduced by a ranked job held by the immigrant. The highest ranked job like being an astronaut earns citizenship within 4 years, while an entry level job like McDonald's worker gets their citizenship within 8 years. Immigrant students are grade based, needing 10 to 20 years. Each day within a job rank or student grade contributes towards shortening the automatic citizenship.