It does make sense that it's a crack as it adjoins two letters. Not that it couldn't be a gouge but, A) it would be harder to create a gouge perfectly from one letter to another and B) cracks usually appear in these types of places.
Hard to tell from the photo but is there also one from bottom of the I in AMERICA going downwards?
Hard to tell from the photo but is there also one from bottom of the I in AMERICA going downwards?

























