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The reason why Jefferson address the declaration of independence to the " opinions of mankind " is that he wanted to know or to declare what is the reason why they or the people want to separate. They need a decent respect for opinions of mankind that they need to declared the cause to the separation.
They took days off of work to be at the parade or entire companies decided to not have work days on that October day. That was such a big event that it was also the first tape parade and some say that up to a million people enjoyed the parade and the reveal of the statue.