This thesis attempts to explain how a popular independence movement in the Spanish region of Catalonia has achieved massive popularity in later years. Based on 6 months of fieldwork in a Barcelona neighborhood among the left-wing nationalist party Esquerra Republicana de Catalunya (ERC), I provide my view on how the politically active Catalans in ERC work towards independence. My argument is that the inclusive nature of Catalan nationalism and the way members equate universal values with Catalan ones are social mechanics that help the formation of a populist people and create a broad independence movement. Rather than being reducible to either a purely emic or civic type of nationalism, Esquerra’s ideology of Catalanism can be termed inclusionist, as it allows the entry of foreigners into the Catalan nation with relative ease, provided they comply with the strong obligation to learn Catalan. This inclusionist tendency has ramifications for Catalanist politics, as members of Esquerra engage with their nationalist discourse by presenting certain broad values as core Catalan traits. This allows for many sectors in Catalan society to identify themselves with said values and forms the basis for a high degree of political mobilization. Due to a change in the political logic of the Catalanist political scene, primarily led by the efforts of Esquerra, the inclusionist tendencies and identification with broad values characteristic of Catalanist ideology lay the foundation for the presentation of all of Catalonia as a unified people. Independence is used as the political goal around which otherwise unrelated issues can coalesce, bringing unity to a populist movement for Catalan independence. In forming my analysis, I first establish a characterization and situation of Catalanism as a type of nationalist ideology. Through the use of Ernest Gellner, Anthony Smith, David McCrone and Michael Billig, I discuss both the importance of history for understanding ERC an