Card to improve credit score and earn rewards (if possible)

Overview

I do not currently have any credit cards, and have not for about 10 years or so because I have been living outside the US. I moved back a few months ago with my husband, who is European, and we have a joint checking account with a local credit union. Being new to the US he has no credit history, and my credit score has fallen into the “fair” range because I have no credit accounts or loans currently (I do have a good repayment history from previous loans and credit accounts). I’d like to get a c

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