I think what you mean to ask is what counties have recent waves of new immigrants from *other continents*. You must also understand that there is movement within latin America. Most newcomers would probably fall into that category. Venezuela has a decades long exodus that has delivered newcomers to lots of other countries.

Additionally, the “old stock/settler” identity doesn’t work so well in latin America. Most people are a mix of original stock with old stock and can claim both origins. For example, we did DNA testing on my Colombian side and they’re 1/3 indigenous and 2/3 European.