To be clear, we need museums. We need history.
But somehow me thinks the "whole story of [all Americans'] epic struggle" (the word "whole" and "all" being italicized for emphasis in form asking for tick-box donations of up to $10K) this museum aims to tell won't dwell overly much on Jim Crow or Indian Law or the Progressive Eugenics movement and the "moron scare".
Italicized "all" here is nod to representation. Representation that glorifies the "lasting benefits" of the "American experience".