For 15 points, identify this 1648 treaty that upheld the Peace of Augsburg and ended the Thirty Years War.
History  This treaty was negotiated by Johann Oxenstierna, and it constrained the power of Holy Roman Emperor Ferdinand III. It ended the Eighty Years War between the Netherlands in Spain and extended religious toleration to Calvinists. For 15 points, identify this 1648 treaty that upheld the Peace of Augsburg and ended the Thirty Years War.
History  This treaty was negotiated by Johann Oxenstierna, and it constrained the power of Holy Roman Emperor Ferdinand III.
Peace of {Westphalia}