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Are credit histories/scores international?
Currently the credit history are not International but are local. Many countries don't have a concept of credit history yet.   Having said that, if you are moving to US, depending on your history in your country, you can ask the same bank to provide you with a card and then start building history. For example in India I had a card with Citi Bank and when I moved to US for a short period, I was given a card based on my India Card, with equivalent credit in USD. If you are moving often internationally, it would make sense to Bank with a leading bank that provide services in geographies of your interest [Citi, HSBC, etc] and then in a new country approach these institutions to get you some starting credit for you to build a history.