Just one thing wrong with your list of countries: Belize (formerly British Hondouras) is an English-speaking country, and a Commonwealth realm (as is Canada, and 14 other nations, who all recognize Queen Elizabeth II as chief of state).
Belizeans are not Latinos. They eat toast, not tacos. Canada is a popular destination for Belizean émigrés. They integrate well, and make fine citizens. (I’m not saying that the country itself doesn’t have plenty of problems.)
Belize would likely vote "no" and probably enjoy its new neighbors.