What happens to people stuck on a land border in North America? [closed]

What happens to people stuck on a land border in North America? [closed] - Top view of paper world map with continents and different countries oceans and seas placed in sunny room

My German friend's US Visa expires, and he plans to travel to Canada, where he does not need a Visa. However, he has overstayed in the past, and so I suspect he has a high change of being refused admission into Canada despite being on the Visa-exempt list. There have been similar questions that for most countries say that he would be taken to a detention centre, who would figure out where he's admissible, and take him to that country. I would like to know what would happen if this happens on the US side, vs. on the Canadian side. Examples of per-country policies from previous posts:

  • U.K. detention centre

  • France detention centre

  • Germany detention centre

  • Estonia detention centre

  • Saudi Arabia holds you right there at the border crossing

  • Thailand allows you to come back to the country as if you never left it

  • Brazil lets you in, but you must stay in the same city, and within 3 days either leave or request asylum

Quite notably, US, Canada, and Mexico are not on the list. Any experience?






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