Why Is My Rear Passenger Tire Tilted Inward?

I purchased a used 2006 honda civic and the rear passenger side tire is slightly slanted inward from the top. I had a few friends tell me about it but I realized it for the first time today. The previous owner told me that the car was involved in an accident before and it was hit in the back. Could this just be the alignment or is it something more serious and expensive?

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