Happy Constitution Day -- a US federal observance that honors the adoption of our Constitution and those who have become US citizens.It is also the 160th anniversary of the death of Dred Scott, a hero of liberty who died personally free but before he would see the full fruit of his labor.As the conservative and libertarian blog Least Dangerous Blog observed, he is a reminder today that while the Union our constitution created was not perfect, it was one that was capable of change, so that we would ultimately hold as self-evident that ALL are created equal and endowed by their Creator with certain unalienable rights, among which are life, liberty and the pursuit of happiness.www.onthisday.com/people/dred-scott