Sherman treated The South like Cromwell, and Cromwell’s son-in-law, treated Ireland. ‘Scorched earth’ came from Cromwell. His army moved most of the Irish landholders out and moved English families in to work those holdings. This all happened 1670 to 1690 or so.
The first five Amendments in the Bill of Rights largely came out of that experience. England is still paying the price for Cromwell, as are the Irish.
I remember my great uncle once referring to himself as a ‘son of the niggers of Europe’. He referred to African-Americans as ‘smoked Irishmen’. I never understood it until I started learning a bit of English history.
Well if you truly want to compare Cromwell's actions in Ireland with the Union army's action in the South then feel free to do so. It betrays a sad ignorance of both historical events.