Apprehensions on the northern border usually want to be found, as asylum claims. Anyone who wants to cross illegally at the northern border could easily do so since forever. So in this case the bazillion other points land in Canada, since those that wanted to illegal into the US from the North always could. That's a "win" for the US from the perspective of the administration.
> Apprehensions on the northern border usually want to be found, as asylum claims
Not anymore, not right away anyway:
> The new terms allow each country to expel asylum seekers who apply for protection within 14 days of crossing the U.S.-Canada border between ports of entry.
https://www.americanimmigrationcouncil.org/blog/us-canada-ex...