How did the protestant reformation start the 30 years war?

The Protestant Reformation sparked numerous wars of religion, which culminated in the 30 Years War.

The German lands were referred to as "The Holy Roman Empire" in those days.  Immediately following the death of Martin Luther, the prominent German leader of the Protestants, war broke out between the forces of the Holy Roman Emperor, Charles V, and Lutheran princes.  Charles V went  to war against the Lutheran princes in the Smalcald Wars (1546-57) to try to force them back into adherence to Catholicism.  There were ongoing struggles in the years after that, and ultimately, the Thirty Years War (1618-1648) was waged in the German territories (aka the Holy Roman Empire) over religious and other issues.  

There were continuing issues of conflict in German territories between Lutherans and Catholics, which were even exploited after the unification of Germany.  Chancellor Otto von Bismarck led a Kulturkampf ("culture war") against the Roman Catholic Church's influence in Germany.

in february 1787, congress decided that a convention should be convened to revise the articles of confederation, the nation’s first constitution. in may, 55 delegates came to philadelphia, and the constitutional convention began. debates erupted over representation in congress, over slavery, and over the new executive branch. the debates continued through four hot and muggy months. but eventually the delegates reached compromises, and on september 17, they produced the u.s. constitution, replacing the articles with the governing document that has functioned effectively for more than 200 years.

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