Edited sentence: By the peace treaty of 1920 with Soviet Russia, the territories of Pskov guberniya were incorporated into Latvia to please its economic interests.In 1920 as a result of nation-building irredentist war Latgale was incorporated into Latvia.Tough enough task, taking into account  territorial interests of both Bolshevik Russia and Poland.United with other "original" Latvian territories, as claimed by the declaration of independence (ethnographic borders as national borders), they formed district of Jaunlatgale, later Abrene district