"It's too bad she won't live! But then again, who does? - Gaff Blade Runner
"In a short time, this will be a long time ago." - Werner Slow West
"One of the biggest problems in the industry is apathy right now." - Dan Didio Co-Publisher of I Wonder Why That Is Comics
But not all of DC's history got "wiped away" by CoIE. Unlike the New 52, DC did try to keep quite a bit of the past history/stories in tact, though sometimes they had to make changes when certain characters were no longer in play. (An easy example of that is the Justice League of America's origin, where Black Canary replaced Wonder Woman in that role.)
Yes, Superman's and Wonder Woman's backstories were taken away, but many other heroes weren't as impacted.
Buried Alien - THE FASTEST POST ALIVE!
First CBR Appearance (Historical): November, 1996
First CBR Appearance (Modern): April, 2014