美国西进运动和西部史学的研究一直是美国历史研究的热点。
The studies on the American Western history and American movement to the West are the hotspots of American historical studies.
他在演奏一部很小的手风琴，美国西进运动中，运河上的工人玩着这种琴，顺着内陆运河漂流而下。
He was playing a tiny accordion, the kind such canal men squeezed as they floated down the inland waterways of a westward-expanding America.
这其中的原因是多方面的，美国历史上的“西进运动”为这一切打下了坚实的基础。
Among them was the Western Expansion Movement, which had laid a territorial foundation for American economic strength.
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