The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. When Russia began to mobilize due to its alliance with Serbia, Germany declared war on Russia.
The printing press helped promote European exploration in the fifteenth century. The printing press allowed for information to be communicated faster and to reach more people. As a result of the printing press, people learned about the explorations that took place.
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