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https://historymusings.wordpress.com/2011/09/17/on-this-day-in-history-september-17-1887-constitution-day-12-13-states-signed-adopted-constitution-phildelphia-convention/
On This Day in History... September 17, 1787: Constitution Day -- 12 of the 13 States Signed and Adopted the Constitution at the Phildelphia Convention