first, the pioneer era (1879–1911), when its basis was put forth; secondly, the foundational era (1911–1951), when the interlinguistics wars took place to decide the most appropriate form of an auxiliary language; thirdly, the school era (1951–1990), when independent Interlinguistics schools formed in different countries, mainly Germany, Hungary, Italy, the Netherlands, and Poland, each with particular attention to Esperanto; lastly, the current era of language policy (1990–today), during which interlinguistics is more tightly integrated with other disciplines, mainly linguistics and various social and political sciences, particularly via the topics of globalism, linguistic justice, management of multilingualism, and new forms of mobility.[5]