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The Christian Union was a league formed by five Roman Catholic Swiss cantons—Uri, Schwyz, Unterwalden, Lucerne, and Zug—in 1529. This alliance was created to counter the spread of Protestantism, particularly from the canton of Zurich, which had embraced the Reformation. The conflict between the Protestant and Catholic cantons is known as the Kappel Wars.

The first war in 1529 saw Zurich advance on the Christian Union, but it ended with an armistice and an agreement that allowed religious freedom in shared territories. However, tensions persisted, leading to the Second Kappel War in 1531. In this conflict, the Catholic cantons defeated Zurich, and the Protestant leader Huldrych Zwingli was killed. The subsequent peace treaty largely upheld Catholicism in disputed areas, resulting in a lasting religious division within Switzerland. This division is still evident today, with distinct Protestant and Roman Catholic regions.12

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