Which of the following was a result of nationalism in europe during the 1700s and 1800s? a. increased peace between nations b. breakup of multi-ethnic nations c. slower military growth d. slower economic growth

The answer is. Breakup of multi-ethnic nations 
Nationalism refers to the sense of pride and superiority of our own home nations compared to others.
In multi-ethnic nations, this type of perspective is really destructive because we put our own ethnic on a baseless pedestal that would only ignite insult and conflict with other ethnicities.

B: Breakup of multi-ethnic nations. A number of multi-ethic countries broke into smaller ethnically-center nations during the period, with the trend helping lead to WWI in the 1910s and the breakup of the Austrio-Hungarian Empire. There was less peace and larger militaries as a result, while the economies grew nicely despite the turmoil.