Migratory Canada geese were once an endangered species, having been hunted nearly to extinction by the early 1960s. In an effort to recover the species and rebuild the population, wildlife agencies throughout the U.S. at both federal and state levels began a program to gather eggs from migratory geese and artificially incubate them throughout the U.S. As a result, these new resident geese had no instinctual imperative to fly to Canada or to leave the region in which they were hatched.
the population of resident Canada geese has exploded to the point that it has become something of a nuisance as these geese make their homes in urban and suburban areas.
(https://animals.mom.com/geese-dont-migrate-6866.html source)
so basically they tried to conserve canada geese but they only tried to conserve the genetics and didn't think of their ancestral knowledge as important to forming their niche and as a result they created a new population with a completely different relationship to the land.
most of the articles like this talk about how they are a "nuisance" in cities and shit a lot, are kind of just Everywhere, and so on, but i havent found a lot on how they impact ecology yet, just on how they impact humans (which i dont care about as much). will let yall know if i find more on this