Question

What territorial changes resulted from the peace of Westphalia, ending the 30 years war

Answer 1

None of these are particularly good but
"end of a unified Christendom" is the best.

My explanation:

The Treaty of Westphalia ended the 30 years war which started as a conflict between Protestants and Catholics. The end was division of Germany between Protestant and Catholic territories which continued until the unification of Germany in 1870.

Answer 2

The Netherlands and the Swiss Confederation became independent states.