Yes DNA shows they are related to this area rather than Central European Celts
Some people in Newfoundland would have Irish ancestry.
While there is no one common ancestry, many of them have Irish ancestry.
There are over 6 times more people claiming Irish ancestry in the USA, than people living in Ireland. Claiming to be Irish-American is very subjective, as some may have Irish ancestry that is several generations back, like one great-great-great-grandparent, meaning their link to Ireland is very small. Others may have both parents that are Irish, giving them a much stronger Irish ancestry. The figures don't specify how far back the Irish ancestry is.
today the Irish trace their ancestry to the Celts.
YES. However, very few people would qualify as having "Irish Jewish ancestry" in that their ancestors were Jews from Ireland since the Irish Jewish community was never terribly large. (Currently, it boasts 400 members.) More likely, if you find a person who claims "Irish and Jewish ancestry" this is a person who has Jewish ancestry on one side of the family (let's say Polish Jewish ancestry on the mother's side) and Irish ancestry on a different side of the family (let's say Irish Catholic ancestry on the father's side).
A Scotch-Irish are the people living in Ireland or Britain sharing a similar ancestry.
No. There are more people in the USA that claim Irish ancestry than the population of Ireland, but there are more actual Irish people in Ireland than there are actual Irish people in the USA.
Irish people settled all around Britain, so in just about every part of it. Irish people and people of Irish ancestry can be found in any major town or city in Britain.
If you are looking for the number of people who claim Irish ancestry, it is approximately 35 million.
Because while he was not the first US president with Irish ancestry, he was the first Roman Catholic US president, and he had Irish ancestry of which he was very proud, and used in his campaign to garner votes.
Ya' think? His ancestry was of Scoth-Irish and English ancestry.
English of Irish ancestry