I think it was partly the New Deal legislation that made it very strong in the United States.

我觉得部分上是因为罗斯福新政,使得30年期限在美国非常流行

耶鲁公开课 - 金融市场课程节选

Why is football so popular in the United States?

为什么橄榄球在美国这么流行呢？

美国和美式足球 - SpeakingMax英语口语达人

One thing that's been a trend around the world is that the I mentioned that the U.S. Federal Reserve System was different from other central banks in that it was designed to have independence.

一个在世界范围内,流行的事实是,我提到过美国联邦储备系统,与其他中央银行不同,因为它有独立自主性。

耶鲁公开课 - 金融市场课程节选