What was the most significant result regarding American identity that resulted from the Civil War?

What was the most significant result regarding American identity that resulted from the Civil War?

The 13th Amendment called for the abolishment of Slavery.
Not sure what u mean by identity ?

Upon the fall of rome, europe ceased being influenced by the cultures of the mediterranean coast and was more influenced by germanic tribal confederations that had already taken over vast swathes of roman territory, although the influence of rome on the former empire was very strong in legal