求翻译：美国梦是美国文学中贯穿始终的主题。不同历史时期美国文学中的美国梦有着不同的表现，如殖民时期的开拓致富梦、建国后的自由民主梦、内战后的扩张发迷梦，而到一战后传统美国梦开始出现迷茫与失落、二战后则走向了绝望与反叛。是什么意思？

The American Dream is the theme throughout American literature. The American dream in different historical periods of American literature have different hair the fond dreams of expansion such as the colonial period to open up rich dream, after the founding of a free and democratic dream, after the C

The American dream is the American Academy of Arts in cross-cutting themes. different historical periods in American literature of the American dream has a different manifestation of the colonial period, such as dreams, develop enrichment after the founding of the freedom and democracy after the civ

The American dream is in the American literature passes through the throughout subject.In the different historical period US literature American dream has the different performance, after like colonizes the time the development to become rich the dream, the founding of the nation freedom democratic

United States is the United States runs through topics in literature. Different period of history United States literature in the United States have different dreams, such as opening up rich dreams during the colonial period, after the founding of the Liberal Democratic dreams, dreams of expansion a

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