If i am correct, I think it is the Aztecs
Answer:
The most direct way nationalism caused World War I was through the assassination of Archduke Franz Ferdinand, who was the heir to the throne of the Austro-Hungarian Empire.
Explanation:
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It changed what they thought about who should govern them and it changed what they thought about the purpose of government. Before the Enlightenment, essentially everyone agreed that countries should be governed by monarchs. They believed that God had appointed certain people to rule over others
