What is the American Dream of the well-to-do built upon？
The backbreaking labor of the working poor. /The bowed backs of the working poor.
The backbreaking labor of the working poor. /The bowed backs of the working poor. 解析第一段最后一句“The American Dream for the well-to-do grows from the bowed backs of the working poor，who too often have to choose between groceries and rent．”中的grows from和问题中的is built upon是一个意思。因此，本题可以用“The bowed backs of the working poor，”来回答，也可以基于理解，回答成“The backbreaking labor of the working labor”。
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