Yahoo! News has a segment called 'Who Knew'. They focused this time on facts about US history that a surprisingly large number of people didn't know. What is Christopher Columbus known for? Can you name the first four US Presidents in order? Watch the video for answers to those questions and more, and to see how many Americans didn't know the answers. 

I'll admit, I didn't know the name of the current Chief Justice of the Supreme Court. I knew the others...How bout you?

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