It seems that you have missed the given options for this question, but anyway, here is the answer. The United States government began using the news media to promote its foreign policy priorities around early twentieth century. Hope this is the answer that you are looking for.
b is the answer hope this helps
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It aimed to resolve the secession crisis of 1860–1861 by addressing the fears and grievances about slavery that led many slave-holding states
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B: Taking part in a civil war.
Explanation: Just got it right.