Because the US had a great geographical location which shileded them from immediate contact with any military force. This was one thing, another thing was that they were lending money to the different European nations which they had to return after some time. All of this enabled the US to catapult itself and become a world power.
You mean the Cold War? Containing communism wasn't a priomary goal of World War 2.
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The correct passage which best reflects common features of realistic fiction is:
From a window of an apartment house that upreared its form from amid squat, ignorant stables, there leaned a curious woman. Some laborers, unloading a scow at a dock at the river, paused for a moment and regarded the fight. The engineer of a passive tugboat hung lazily to a railing and watched. Over on the Island, a worm of yellow convicts came from the shadow of a building and crawled slowly along the river's bank.
(<em>Stephen Crane, Maggie: A Girl of the Streets)</em>