It should be said that Wales works with counties and more often church parishes, so these are the areas you need to look.
When researching within the areas of the British Isles it needs to be remembered that prior to 1776, the Americas were a property of England and therefore
no immigration papers existed nor any Oath of Allegiance. Also, many ships coming from Germany stopped in England and English persons also boarded for America so they are later
listed as having departed from England when they were actually German ships..by the same token, English, Irish and Scots were sometimes found on German named ships.
Wales Genealogy; History, Language, Culture
Welsh and Scot Settlers of Pennsylvania & Virginia