There are some credit scores for many folks in USA (and I believe in other countries). Let's say you move from USA to UK, Singapore, Hong Kong, or Japan. Does your credit rating go with you?
Probably not. I moved from Europe to Canada and there was no way I could get my credit rating transfered.
Credit card issuers actually all operate locally. Each country has regulatory control over the local operator. These local operators may be managed internationally but none of the information gets shared. When you leave a country, your credit rating stays behind.
In the case, I will buy top of the line MacPro, MBP(s), CS3 (later in 2007), Cinema 4D, ACD(s), Final Cut Studio and other things to max out my credit cards and take a hike then.
3 years ago, Equifax had no prior knowledge of me, neither did Transunion. That may have changed by now, I don't know.