The success of the Reformation in Zürich and its rapid territorial expansion definitely made this religious renewal a political issue and a major source of conflict between the thirteen cantons. The alpine cantons of Uri, Schwyz, Unterwalden, Lucerne, and Zug remained staunchly Catholic. Their opposition was not uniquely a question of faith; economic reasons also played a role. Besides on agriculture, their economy depended to a large degree on the mercenary services and the financial recompensations for the same. They could not afford to lose this source of income, which was a major target of reformatory criticism. In contrast, the cities' economies were more diversified, including strong crafts and guilds as well as a budding industrial sector. Fribourg and Solothurn also remained Catholic.