@PRlady Does Russia not allow dual citizenship?
Russia allows multiple citizenships, as does the US. There are general caveats/exceptions, like diplomats' kids born in the US, maybe during active postings only, who are exempt. There's also no guarantee that any country won't change the rules and not grandfather in people with multiple citizenships, or select specific countries, like if at war, and including retroactively, where people can't hold them.
Continuing: Unless you're born to an exempt class, if you're born in the US, you get US citizenship. No choice necessary, unless, as an adult, you renounce US citizenship. That is why visibly pregnant brown, black and poor people and non-English speakers can be turned away at the border and there's incentive to deport them.
If parents enter the US legally, the child can eventually sponsor the parents for citizenship. If the parents entered illegally, they can be deported at any time, and applying for sponsorship exposes the entry. It used to be that if you entered the US legally, but overstayed your Visa, if you married a US citizen, and didn't have a criminal record, your spouse could sponsor you and your non-US-born children, like friends' spouses have, but I've been reading and hearing that this can lead to deportation under the Trump Administration. And possibly under the Obama Administration, which deported record numbers, but I don't know if this scenario was a major target.
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