Final answer:
The first wars of religion during the Protestant Reformation occurred in Germany, following the spread of Martin Luther's ideas leading to the Thirty Years' War between Catholic and Protestant states.
Step-by-step explanation:
The first wars of religion during the Protestant Reformation took place in Germany. The Protestant Reformation began in 1517 when Martin Luther posted his 95 Theses on the church door in Wittenberg, challenging the Roman Catholic Church.
As a result of Luther's actions and the spread of his ideas, religious wars erupted across Europe, especially in Germany, which saw the devastating Thirty Years' War from 1618 to 1648 between Catholic and Protestant states within the Holy Roman Empire. This war had Protestant victories and culminated in the Peace of Westphalia, essentially transforming the political and religious landscape of Europe.