Proclaimed in 1868, and originally known as Decoration Day, 
Memorial Day was slow to catch on in the South, which, understandably, had their own day to memorialize their war dead. We must honor them too - they were fighting for freedom, as they saw it.
How easy it is to forget the meaning of the holiday - the day to remember fallen soldiers, and to decorate their graves - unless you have lost one recently, or saw pals die in battle. In that case, it's easy to remember.
It shames me to think how much of what I take for granted has been bought with blood, sweat, and tears. How do you thank the dead, other than with remembrance and prayer?
A detailed history of Memorial Day here.