Well, we did built the world number 1 economy and military superpower in record time. You got something better than number 1?
"we", well not me, but what you say is true, as far as it goes. "we" (not me) killed over 600,000 young men (blues + grays) in the first mechanized war in history; "we" not me ethnically cleansed the prairie of Native Americans (NA's), stealing their land and nearly exterminating the American Bison.
Getting to be number 1 had costs, paid mostly by the common man; once we had achieved our Manifest Destiny we enjoyed the Gilded Age, one more event where the rich got richer and the common man paid with his labor and his life.
Sound a bit like life in the first decade of the 21st Century, doesn't it?