Why is it called "Black Friday"?

Does anybody really know? I assumed it was because the stores went
into the "black" after taking our money selling things that should be
that price anyway. Maybe its because it is still dark outside
when people start forming mile long lines outside of Best Buy. The
tactless politically incorrect part of me says its because we all,
white, black, red, yellow and reggaeton ( (c) TC) tend to act a bit
"niggardly" out there. You people are insane. I have seen middle aged
Oprah watching white women jacking shopping carts. I think its all a
bunch of hogwash. If you think about it the sales aren't THAT
great...are they? I may be just salty because my money is so hilarious
this year ...but hey...I'm sleeping in tomorrow....and while you
guys are out there throwing bows with soccer moms? Ill be on the treadmill.
If I do go out shopping it will be later on, and I will be strapped!
Take care and Happy Holidays!