Huh? It's notorious for doing just that. From the bizarro workship of the founding fathers, to celebrating people like Custer, to the whole Confederacy thing in the South, and so on. All kinds of dark history, from the treatment of Chinese in 19th century, to the mass murders of immigrants and workers fighting for their rights (e.g. at Ludlow) are swept under the rug.

>We acknowledge that the wholesale destruction of first peoples was a horrific act of violence, and the US does not cover up the ugly parts of its history. We talk about it openly.

Only in the sense that people don't go to jail for talking about them. Otherwise, the official histories and accounts all sidestep the ugly parts of history, wash them out in official narratives, and so on, and it takes people like Howard Zinn to make them somewhat known.

Heck, people are still taught the nuclear bombs in Hiroshima and Nagashaki where "necessary" and used to "stop the war".