According to this reddit person, the typical white TFR was 1.5443 in 2022. So I’d guess that the uber-liberal Northeastern USA is probably behind the average in TFR of whites, even though the Northeastern culture appears very strong from the outside, and liberals insist that it about as good as it gets…
Vermont, often touted as the most liberal and idyllic state, has the lowest TFR of any state. In some kind of objective sense, it should be seen as having the weakest culture of any US State. Only DC is behind it, and DC is not really a state, it is a metro area. It should be mentioned, though, that there are far more black births in DC than white births (look it up).