I asked this question in various places in the Web. I haven't received a clear answer. The USA separated from the UK because the people felt that they are not British, and they weren't. Weren't ...
There is a folk tale of an Egyptian princess in Ireland around 1700 BC. Is there credible evidence of early contact between the two places?
The Taaffe family is rather remarkable for having held both an Irish/UK and Austrian peerage. However, it is not clear from the wiki pages whether they (for example, Count Eduard, who was Austrian ...