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Why America's Independence Day is celebrated on July 4

This Fourth of July marks the nation's 240th birthday. In 1776, the Continental Congress officially adopted the Declaration of Independence, but one of the founding fathers and second president, John Adams, didn't think the Fourth was the right day to commemorate the start of our nation. Kenneth C. Davis, historian and author of "Don't Know Much About History," joins "CBS This Morning" to discuss why.
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