Some reflections:

      For 70 years after the Constitution was implemented there were over 200 slave revolts. Many slaves fought for and gave their lives attempting to obtain their Constitutional and Human Rights. There should be a monument built in Washington DC to these truly noble and heroic Americans.    
     After the Civil War, the 13th and 14th Amendments gave Slaves freedom, democracy, and citizenship. However, for the next 100+ years most Black Americans were routinely and at times "legally" denied their Constitutional and Human Rights. For the next 100+ years many great Black American heroes fought, died, or were lynched in countless struggles culminating in the great Civil Rights movement of the 1950s and 1960s.
      In 2005 the US Senate officially apologized for stubbornly refusing to pass anti-lynching laws throughout US history.  In 2008 the US Congress officially apologized for 240 years of horrendous slavery and the 100+ years of hideous racism (and lynchings) after the Civil War.   Today, the prison population is over 2.3 million people and increasing - half of them are Black. It seems like something is still not right.
       Even though they were almost annihilated by the endless wars and massacres against them, Native Americans fought and died in defense of their freedom, religion, homelands, culture, communities, and families. Although their land, culture, and children were still being taken from them, Indians were "given" citizenship and the right to vote in June 1924. Today, Indians are just about last in all sociological, economic, and political categories. (If most Americans knew more Native American history, they would be horrified, outraged, disgusted, and ashamed).  
     For 130 years, women encountering ferocious opposition fought, struggled, and were finally "given" the vote and democracy in 1920. The Constitution had to be amended to allow this. The Women's Rights movement in the 1960s and 1970s further ensured that women would always have their rights and equality.  
   In 1938, under the Fair Labor Standards Act, and after 150 years of bitter, brutal, and bloody labor struggles, the horribly exploited working class was given the 8 hour day, 40 hour work week and many other humanitarian benefits workers enjoy today. Child labor was outlawed. But sadly, today the struggle continues. Anyone speaking out for the Working Class, minorities, and poor are demonized as Socialists, liberals, Leftists, or anti-Americans.
    So, in rightfully celebrating the US Constitution, we should also remember, thank, and honor the countless heroes who fought for the Vote, Freedom, Democracy, human rights, or equality denied them after the Constitution was written and signed by our Founding Fathers. They helped make America great. We should also remember there is still work ahead to make the US Constitution more applicable to everyone. For example, ten percent of Americans own and control 90% of the wealth.  If the vast majority of Americans are working class or poor, how did the US Constitution (and democracy) allow this to happen?