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Instead of a hot topic just for current politicians, the issue of immigration has its root deep in the US history.
When it comes to immigrants to America, historians are likely to distinguish them into two periods--new and old. Let's get a better understanding about the difference and sameness from the following ppt.
Produced by Peter Fu.
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大牛，别默默的看了，快登录帮我点评一下吧！:)
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