Dutch diaspora
Emigration from the Netherlands has been occurring for at least four hundred years, and may be traced back to the international presence of the Dutch Empire and its monopoly on mercantile shipping in many parts of the world. Dutch people settled permanently in a number of former Dutch colonies or trading enclaves abroad, namely the Dutch Caribbean, the Dutch Cape Colony, the Dutch East Indies, Surinam, and New Netherland. Since the end of World War II, the largest proportion of Dutch emigrants have moved to Anglophone countries, namely Canada, Australia, New Zealand, and the United States, mainly seeking better employment opportunities. Postwar emigration from the Netherlands peaked between 1948-63, with occasional spikes in the 1980s and the mid-2000s. Cross-border migration to Belgium and Germany has become more common since 2001, driven by the rising cost of housing in major Dutch cities.
Batavianization
The term "Batavianization", derives its name from the Batavi, a Germanic tribe living in the Netherlands, and long regarded as the mythical ancestors of the Dutch people. The term "Dutchification" is mostly used in English publications by Dutch authors, less so by native English-speakers. This likely has to do with the fact that "Dutch" isn't a Latin-derived term and hence sounds somewhat childish to some ears in combination with the (Latinate) suffix "-fication". As for "Belgianization", "Belgae" was the standard term in Latin to refer to the Dutch (compare the Leo Belgicus, United Belgian States and Belgic Confession for example) in the Late Middle Ages. After the establishment of Belgium, its use generally shifted to mean Belgicism.