Legal question: If a neighboring province adopts a foreign entity, what are the implications for port access?

This is a genuine logistics question and I'm hoping someone with trade law or interprovincial commerce background can weigh in.

Hypothetically:

If Alberta were to adopt a large (695,662 km²) entity currently located in the southern United States, and Saskatchewan co-signed as an interdependent partner, BC would become the primary Pacific port access for this new bloc.

Questions:

1. Are there existing frameworks for this kind of arrangement, or would new treaties be required?
2. The entity in question has approximately 31 million residents, significant oil/gas infrastructure, and a cattle industry that would combine with Alberta's to create substantial market influence. Does BC have any say in this?
3. If the adoption proceeds, does BC get visitation rights, or are we just expected to handle the shipping?
4. Vancouver Island has historically had its own autonomy movements. Does this change their calculus?

I'm asking because some paperwork is apparently being prepared and I feel like we should be having this conversation.

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