Jay,
You obviously know nothing about American history if you think today is "the darkest day in American history."
I could offhand think of at least a dozen darker days in American history. Like Washington losing NYC to the British, the burning of Washington DC in 1814, the Dred Scott decision declaring Blacks cannot be citizens and extending slavery, any battle of the Civil War like Antietam or Gettyburg, the premature end of Reconstruction, Plessy v Ferguson 1898, the Spanish-American War, he treatment of Black soldiers at anytime prior to the 1980s.
Should I go on? Or can you wiki these things for yourself?