Final answer:
The Spanish-American War was caused by several factors, but the U.S. Army invading Cuba was not one of them.
Step-by-step explanation:
The Spanish-American War was a conflict between the United States and Spain in 1898. Several factors contributed to the outbreak of the war, including the U.S. Army invading Cuba, the explosion of the U.S.S. Maine in Cuba, the exaggerated news by William Randolph Hearst's newspaper, and the publication of the Dupuy de Lome letter by an American newspaper. However, one of these options was not a cause of the war. The correct answer is U.S. Army invades Cuba, as the U.S. intervention in Cuba came after the war had already started.
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