This paper examines how Latvian communities abroad reacted to and were influenced by a change of the first magnitude in the political life of their homeland, namely, the proclamation of the Republic of Latvia on November 18, 1918. News of the proclamation, first of all, necessitated diaspora Latvians choosing attitudes towards the new phenomenon, which highlighted the political pre‑dispositions of the different groups within the diaspora. Polarisation of opinions was followed shortly by a wave of activities both in support of and against the new Republic. These activities included gathering financial resources for war victims and state institutions in Latvia, public relations campaigns in diaspora host countries, political lobbying etc. The establishment of the Republic of Latvia also profoundly influenced and intensified the internal formation processes within the diaspora. A marked increase of activity is observable in all fields of engagement that are characteristic of an active ethno‑national diaspora: the internal organisational structure was further developed; contacts with the homeland intensified; mutual links between geographically distant diaspora groups became closer. The great political changes in the homeland gave the Latvian diaspora the push necessary to fully develop and become an active ethno‑national diaspora.