in the shadows
Commonly held definitions by words may AFFECT the descriptions of physical reality but not EFFECT the substance of that reality. The affect of a change in acceptable definition may effect a change in the perception of reality, but not in its substance.
So, get enough people to call an apple an orange and it will be known as an orange; that will not change the substance, taste, color, texture, etc. of the fruit.
After World War II, the swastika has generally been seen as a symbol of an unacceptable collection of social, economic and/or political theories and beliefs. In some parts of the world this affect has even made the display of the swastika a violation of law. Prior to the rise of the German Third Reich, the swastika in any one of several forms (and in either rotation) for over three thousand years in many cultures was a positive symbol of luck, a symbolic force of "good" energy. The affect of hatred was to change the belief in acceptability of the symbol's use. The effect is that this symbol of positive life force is seldom seen today in a positive light.
Similarly a society, or its ruling power structure, might promote an affective change in that society's history in the hope that the effect will be to change history itself. This is in one way reflected in the old saw that "history is written by the winners." In this case if the revision is thorough enough, in time when all those living at the time of affect are dead and replaced by generations who hold as real the affective bit of historical fiction, then effect takes over, the fiction becomes the only known reality, and any decision leveraged by that point of information will be effected by the original intentional affect.
This is not the case with the apple; after a thousand generations the apple (at some point only known by its affective name "orange" ) will still have the same physical properties that it had when it was known as an apple, and when one of those future people thinks of an orange they will be thinking of what is today called an apple.
See, my soul wandering Witch? It is simple. *grin*