Brooks: "America has always been a divided, sprawling country.... held together by a unifying national story..... it was an Exodus story. It was the story of leaving the oppressions of the Old World, venturing into a wilderness and creating a new promised land.... 
That story rested upon an amazing level of national self-confidence. It was an explicitly Judeo-Christian story, built on a certain view of God’s providential plan."

And this is exactly the problem-- this Exodus story glorified the invaders and discounted the indigenous inhabitants as worthless savages of no consequence---just as Israeli Jews proclaimed when they took over Palestine from the Arabs "A land without people for a people without a land ," our European Christian ancestors felt they had God's backing when they took over this Garden of Eden from the Native Americans.
Now that we better understand our history we have a better chance for creating a true multicultural society honoring all, "E pluribus unum."