Can you present an historical event or series of event where you believe history has been erased as well as your reasonning behind this choice?
Oh, well...that can happen.
I mean to say, it might not be COMPLETELY erased, else how would we even know what to put up?
But certain events are largely ignored in popular history. A LOT of events.
And even moreso than 'erased' they become remembered in different ways.
Who remembers now that German soldiers were tortured by Americans after the cessation of hostilities? Who remembers the limitations on Jewish immigration the UK put in place immediately preceding the Second World War?
Meh, I'm not potting the Allies here. All I'm doing is suggesting that ALL history is remembered with a certain flavour to it. And the victors commonly write it. In the case of Confederacy statues in the South, it's a little more unusual in that the losers got to write it in the interests of reconciliation at a point post-war.