Answer :
Final answer:
U.S. entered WWI, WWII, and War on Terror due to various reasons.
Explanation:
Causes of U.S. Entry into World War I, World War II, and the War on Terror:
World War I: The U.S. entered due to German unrestricted submarine warfare, the Zimmerman Telegram, and defense of democracy. World War II: Factors included Japanese bombing of Pearl Harbor and Nazi aggression in Europe. War on Terror: Reaction to the 9/11 attacks and the global spread of terrorism.
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