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In OTL James Longstreet converted to Catholicism after the war and this had a huge impact on him as a person and he came to embrace reconstruction ideas like integration and an end to racism.
Now my question to you is what if he converted to Catholicism pre-war and it had a similar impact on him and he becomes an abolitionist and fights for the the Union?
Now I know its borderline ASB but its a unique concept none the less.