<span>By gradually building up the sea power of the US Navy.</span>
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As I answered before, when a world war has just finished, the country's resources are depleted. So, it is difficult to provide jobs and houses for returning soldiers because these would require manpower and monetary resources. The period after the war is dedicated to picking up the scrap and trying to make do with what's available through cooperation. So, for me, the most appropriate course of action is helping labor unions work together with businesses.
Since nomadic means to always travel (go to place to place)
A is the answer