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The start of World War I can be traced to which of these factors?

A. Nationalism and patriotism in many European countries was at an all-time low.

B. Powerful monarchs became over-confident in their ability to rule large populations.

C. The Ottoman Empire attempted to expand into Eastern Europe.

D. Alliances meant that if one country was attacked many more would be drawn into war.

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D. Alliances meant that if one country was attacked many more would be drawn into war.

After Austria-Hungary declared war on Serbia after a Serbian killed Archduke Ferdinand and his wife. Because of this declaration of war, Russia, in aid of Serbia, declared war, followed by Germany and other nations.

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