How did Calvinism influence the Thirty Years War?

Calvinism significantly influenced the Thirty Years War by intensifying religious conflicts between Protestant and Catholic states in Europe. The rise of Calvinist communities, especially in the Holy Roman Empire, challenged Catholic hegemony and fueled tensions. The war began as a struggle for religious freedom and political power, with Calvinist factions seeking to assert their rights against Catholic rulers. Additionally, the involvement of Calvinist countries, such as France and the Netherlands, further escalated the conflict, aligning religious and political interests.