The most important date in American history is July 4, 1776 Independence Day, the second most important day is April 12, 1861 , the day the Civil War began. The attention paid to this date is scant even on the 150th anniversary. Why is it important? First and foremost the war brought an end to slavery and led to citizenship being granted to all born in the United States . Beyond the monumental achievement of ending slavery, the Civil War set the legislative stage for Lincoln to start the country moving from a loose collection of states, as Lincoln called them, to becoming the United States of America as we know it today.
So When you are next casting about for something profound to say at the next social get-together remember the second most important date in American history. And for those who like counter-factual considerations, imagine how we would have fought World War I or II or contronted the Cold War if we were still a loose collection of states. We'd have looked just like NATO, made up of European Union countries, trying to organize themselves to end Gaddafi's rule or muster more that token support for Afghanistan.