The host has to put the largest chunk of the budget on the table. And you need concrete proposals originating from the host about potential sites, etc... For now, there was only two. Note that I have no clue about the size of the particle physics community in Nigeria. You may know better than I do :)
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In terms of budget and proposal, I think CERN would have it. Maybe CERN would be the potential host of the new collider
Both CERN and China can have them (which is why they are connected to concrete proposals).