Possibly allies and they way they interacted with other countries, by trade etc. and strengthening their economy for war.
I would pretty much say oil in the modern day it would make the most sense
Answer:
The Europeans reinforced the idea that citizens could have little or no say in the government.
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The Habsburg Empire was on the verge of collapse, because these wars caused monumental state debt and financial crisis. The Habsburgs were forced to reconcile with Hungary, to save their empire and dynasty.