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WI The De valera had made a different set of moral and political calculations and declared war on the Nazis because they had bombed Irish territory (I mean the 6 Counties rather than the apparently accidental bombing of Dublin.)
1) How big a difference would Irish bases in the South West have actually made to the Battle of the Atlantic?
2) How big of a difference would they have been seen as having made byt people living in such a timeline?
3) How much difference would that make to relations with the North?
4) Would there have been any measurable downside for the UK and US?
I accept that this was unlikely but I am aware that Irish Neutrality was an issue which Unionists especially liked to bring up.