What was a important reason for the rise in nationalism during napoleons era

After seizing political power in France in a 1799 coup d'état, he crowned himself emperor in 1804. Shrewd, ambitious and a skilled military strategist, Napoleon successfully waged war against various coalitions of European nations and expanded his empire.

d is the answer

i took the

~coco

there are many answers to this question, such as a diplomat, ambassador, soldier, united nations employee, cia, etc.