Our most basic common link is that we all inhabit this planet. We all breathe the same air. We all cherish our children's future. And we are all mortal.
The assertion that 'all men are created equal' was of no practical use in effecting our separation from Great Britain and it was placed in the Declaration not for that but for future use.
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We are made wise not by the recollection of our past but by the responsibility for our future.