1) After a period of turmoil, absolute monarchs ruled Austria and Prussia in Central Europe in the 17th century.
2) Tensions rose between Lutherans and Catholics, leading to a Protestant revolt in Bohemia in 1618 and triggering the Thirty Years' War over religion, land, and power.
3) The Thirty Years' War ended in 1648 with the Peace of Westphalia, which weakened the Hapsburgs, strengthened France, and established Europe as a group of independent states.