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I would suspect the corruption charges will spill over into many other Federations not just CONCACAF and South America. I can't imagine Asia or Africa have been squeeky clean.
The thing is that those two Feds do their business through the US whereas it is likely Asia & Africa don't do their business through the US. This could be the only reason they get away.
If any payment has been made in US$ - regardless of the physical location of the sender / recipient, then it is routed through a US Bank at some point.
Not true. SWIFT payments and Bank drafts come to mind.
A SWIFT payment, Bank Draft / Cheque , A/C denominated in US$ etc - Is ulimately processed / held at a US Bank