What if a country gets their internet shut off from international connections?

If you want to answer, Please read the whole question and avoid using ai.

There’s miners and nodes all around the world. But, imagine that I live in Canada.

Assume that the internet in all of Canada gets blocked for outbound connections, meaning you can only communicate with other Canadians online, only Canadian Nodes, and miners. This is of course assuming there’s absolutely no international internet, including no starlink.

After just 10 minutes, wouldn’t there essentially be 2 different blockchains? An international one and a local Canadian one? Assuming that each block was filled (1mb), and the international blockchain was also getting filled, What exactly happens once the Canadian internet opens back up?

Does the canadian version get ignored and everyone continues without those transactions? Do they get squeezed in?

Do we have any real examples of this on a large scale for a country with Miners and Nodes or will the answer be speculative?