How did the thirty years' war influence the development of national identities in europe?

a. it turned most of europe against the catholic church.
b. it led to the development of spain as europe's greatest power.
c. it wiped out most of europe's protestant population.
d. it forced kingdoms to establish clear boundaries.

It is D. It forced kingdoms to establish clear boundaries.

Economic success prussia had a very strong economy, partly due to the success of the zollverein. stronger prussian army king wilhelm wanted to build a bigger, stronger army but was blocked by the prussian landtag (parliament).-credits to google for putting answer -credits to slideshare for making answer-credits to me for putting answer on brain.ly