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It sounds like you might be using an automatic redirect based on IP. Is that true? If so, that's why Google is only showing the US numbers. They don't prefer one over the other, but you are inherently only showing them the US numbers if you are doing that redirect. My suggestion is to let people set their location with a javascript based popup that sets a cookie. That will then modify the numbers. If you prefer Google sees the metric numbers, show that to any user that doesn't have a cookie set.