Scholars frequently portray the end of the Habsburg Monarchy as driven by nationalist revolutions in the provinces. The experience of the Jiu Valley, Transylvania’s largest coal basin, demonstrates that nationalism was neither the only basis for revolution nor the most popular in all parts of the province. The multiethnic working class of Jiu embraced revolution as a response to state failures to provide basic services in a worsening wartime economy, even as state demand for coal rose. The miners created the Black Diamond Republic in October 1918 as Austro-Hungarian armies collapsed in an effort to actively negotiate their status after the war. The miners embraced revolution not as a bid for independence or ethnic secession but as a means to maintain local union power and negotiate the conditions of their inclusion in either Romania or Hungary. While “Romanian” and “Hungarian” councils were formed, such identities in Jiu were also linked to occupation (worker, peasant, or intellectual) rather than clear definitions of ethnicity.
