Sista brevet till Sverige (1959) är sista delen i Vilhelm Mobergs stora Utvandrarepos som under hela 1900-talet varit en mycket läst och älskad svit och som även filmatiserats. Det är svårt att föreställa sig någon enskild svensk författare som mer påverkat så många svenskar under en så lång period som Vilhelm Moberg gjort och fortsätter att göra.
Karl Oskar, numera Charles O. Nelson, är gammal och sjuk. Kristina dör och en ny generation, som i språk och tänkesätt skurit av banden med Sverige, tar vid. Karl Oskar vandrar i tankarna till barndomen. Att rota sig i det nya landet har varit mödosamt. Men då det ryktades om nödår i Sverige, kunde han sända ett lass vete till släkten samt dollarsedlar i breven hem.
Vilhelm Moberg was a Swedish journalist, author, playwright, historian, and debater best known for his Emigrant series of novels about Swedish emigrants to America. He also wrote other novels and plays and also participated in public debates about the Swedish monarchy, bureaucracy, and corruption. Among other works are Raskens (1927) and Ride This Night (1941), a historical novel of a 17th-century rebellion in Småland acknowledged for its subliminal but widely recognised criticism against the Hitler regime.
A noted public intellectual and debater in Sweden, he was noted for very vocal criticism of the Swedish monarchy (most notably after the Haijby affair), likening it with a servile government by divine mandate, and publicly supporting its replacement with a Swiss-style confederal republic. He spoke out aggressively against the policies of Nazi Germany, the Greek military junta, and the Soviet Union, and his works were among those destroyed in Nazi book burnings. In 1971, he scolded Prime Minister Olof Palme for refusing to offer the Nobel Prize in Literature to its recipient Alexander Solzhenitsyn – who was refused permission to attend the ceremony in Stockholm – through the Swedish embassy in Moscow.