A short summary of what’s going on here: The land in question involves an aboriginal reserve that has a border going through it. Canada used to have its border post at the physical border. But felt that this allowed too much smuggling with the reserve all around it. So the feds move the border post inland: at the border of the reserve and the rest of Canada. As a result, the “correct” procedure to enter the Canadian…
My understanding is that moving the border post had more to do with poor community relations. It became too much of a hassle to maintain it on Akwesasne land: