“当我想撰写一部美国外来移民史时,我才发现外来移民史就是一部美国史。”美国著名移民史学家奥斯卡·汉德林在其颇有影响的《拔根者》中开宗明义地写下了这句话。众所周知,美国是一个典型的移民国家,除了土著印第安人外,可以说所有美国人都是移民或移民后代。然而,随着社会的发展,美国对待移民的政策或者态度前后反差极大。一个由移民组成的国家抵制移民,这又是为何呢?为什么非法移 “When I wanted to write a history of American immigrants, I noticed that the history of immigrants was an American history.” Oscar Handlin, the famous American immigrant historian, This sentence was clearly stated. As we all know, the United States is a typical immigrant country. Apart from indigenous Indians, it can be said that all Americans are immigrants or immigrants. However, with the development of the society, the United States has great contrasts in policies and attitudes toward immigration. Why does it happen when a country made up of immigrants boycotts immigration? Why illegal migration?