Answer:
New Sweden: Swedes, Dutch Finns...
New Amsterdam: French, Dutch Germans...
Pennsylvania: Quakers, Catcholics...
Explanation:
Machine guns, Flamethrowers, and Mortars.
One way to describe them is to call them "invasive species" - that is, a species which is non-native to the place (was brought from another place), but which can live and spread very well in that place and which can cause other species to go extinct.
One other example of invasive species are cats.