The assassination of Archduke Franz Ferdinand was the immediate cause of US entry into World War I.
The immediate cause of the United States' entry into World War I was the assassination of Archduke Franz Ferdinand in 1914. This event triggered a series of declarations of war among European nations, leading to a global conflict.
Germany's response to the assassination further escalated tensions, drawing in various countries through alliances and military mobilizations.
Ultimately, the assassination acted as a spark that ignited existing tensions fueled by nationalism, alliances, and militarization, culminating in the outbreak of World War I.
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