Responsible for promoting economic prosperity.
They did believe them<span />
All of the following played an important role in the outbreak of World War I except "<span>D. a deadly flu pandemic," since the spread of disease had no impact on the rise of either nationalism or militarism. </span>
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The answer is isolationism.
Isolationism refers to America's longstanding reluctance to become involved in European alliances and wars.
It is the political principle or practice of showing interest only in your own country and not being involved in alliances, foreign economic commitments, international agreements, etc.