I just became permanente resident!

I just became permanente resident!
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I have a credit card for more than 11 years, and on my statements say my FICO Score is 790 and also say that score was pulled on some date. The card and account is from USA, in that time they are allowed to give credit card to foreign person, I think now is different

But all this years I was a foreign person until now that I became a permanent resident and I would like not to lose all this years and this credit score, but I just get a SSN

A lot of people told me that I have to start from scratch, that this score and years is like is not valid at all. What do you think? There is a way that this be useful for me ? Thanks !