Nice article here by Shay Dunphy on the Irish experience in Newfoundland.
‘Waterford Parted from the Sea’ – The Irish in Newfoundland | The Irish Story
I think there's Radharc film from the 70s, which shows how 'Irish' - in accent, customs and music, the people there still were. (Are they still?) Apparently it started off as seasonal migration by fishermen from the south-east, principally County Waterford in the late 18th century and became permanent settlement some time in the mid 19th. One of the few Irish communities in North America to remain predominantly rural on he other side of the Atlantic.
One of the interesting things for me was that they in turn migrated fro work to US cities and were influenced, in music and other ways by Irish-American culture. Human societies being endlessly innovative I suppose.