Yall are right.
Over the past decade or so both the Canada and snow geese populations have exploded, especially the snows. So with the massive crowds of birds, nature just finds a way, and some birds become locals to an area as room is running out in their normal ranges.
We have them do the same thing here in south GA, in the 1000's.
Yet, 15 years ago, I had never seen a wild goose here in my life, now they are nearly a nussance on many local farms.
P.S. You are also right as "NATURALLY" most all waterfowl tend to nest in the great lakes area and north into Canada, but that's changeing too!
Aubrey