Austria-Hungary invaded serbia after the assassination of the arch duke Ferdinand. This started World War 1.
<h2>Answer:</h2>
promoted a stance of isolationism
<h2>Explanation:</h2>
What ensued was a radical shift in U.S. foreign policy, which promoted a stance of isolationism that would last until World War II. Warren Harding won the 1920 presidential election on the promise of staying out of global affairs, and by arguing that the United states needed normalcy and a focus on internal problems.
<h2>#CarryOnLearing </h2>
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The answer is B. Celts.
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Celts believed that collecting heads after a battle was one of the greatest honors. Heads were their trophies.
