[graemep]

In this context it is a synonym for jus soli - birth happened on the soil of the country.~

Birthright has a few other meanings in wider contexts: https://www.collinsdictionary.com/dictionary/english/birthri...

Does it really matter if we add one more, especially as it is now a well established usage?

[cmbuck]

Yes it matters, because jus sanguinis is also a birthright and therefore "birthright citizenship" despite having no relevance to where you were born (jus soli)

[fmobus]

It matters. Because if the proposed executive order were to prevail, the US would effectively drastically change its citizenship assignment system, but it would still hinge on a right derived from a circumstance of your birth - a birthright. Essentially, it would move from "you are a citizen if you were _born_ in the country" to "you are a citizen if you were _born_ to a citizen".