How can you make claims like "99.9% of those topics are not even addressed in high school", when you a) haven't seen the inside of an American high school history class for 60 years, and b) don't even remember what topics were taught when you were there to begin with?
Well, some of the topics brought up in the referenced 99.9% happened in the past 60 years:
Indian wars. Slavery. Indian Removal Act -- and motivations. Mexican-American war. Spanish American war. Annexation of Hawaii, Chinese exclusion act. Palmer raids. Bananna wars. American nation-builing in Latin American and the Middle East. Motivations for same. Motivations for WWI, Japan's offer of surrender -- before atomic bombings. Motivations for the Vietnam war. Nixon's interference with Paris Peace Talks, Middle East wars, and motivations. Taliban offer to surrender Bin-Laden, and American refusal,
Such as the Vietnam War, Middle East wars, and other events which happened since 1960.
Admittedly, there were a lot of things that I didn't get in high school either, and I only graduated a mere 40 years ago. Sometimes it depended on the teacher and how willing he/she was to go outside the standard curriculum.
Certainly, Slavery and Abolition, the Indian Wars, and the Civil War were covered extensively, along with the American Revolution, Declaration of Independence, and the Constitution.
The Indian Removal Act was covered, as I recall, although it would generally be included as part of the overall topic which (in my school) was called "Westward Expansion." That would also include the Mexican-American War. The Spanish-American War and the Annexation of Hawaii were given light treatment, but those events were covered. Same for the Chinese Exclusion Act.
In addition, there was next to nothing discussed about the processes involved in the transfer of the Philippines to US control after Spain ceded that territory after the war in 1898. I do recall a brief mention in one of my textbooks that, when the US took over the Philippines, we told them we would grant them independence as soon as we could teach them how to govern themselves. And we did grant them independence after WW2, so yay for us!
We never went over the Palmer Raids - or even McCarthyism for that matter. Although I do remember in one of my high school classes, our teacher was friends with a retired Army general. He came to visit us to talk about MacArthur's liberation of the Philippines from the Japanese, as he served under MacArthur and participated in that campaign. On another occasion, he visited us to show us a video from the American Conservative Union, which focused on the dangers of the Soviet Union. The Reagan Administration at the time was very much distressed and frightened of the Sandinistas in Nicaragua, and this video talked about how they were planning to spread throughout Central America, into Mexico, and then the United States. (I think the writers of the movie
Red Dawn must have watched the same video, as the movie portrays the exact same scenario.)
So, the status of the US and our history, at least as it was late 70s/early 80s, when I was in school, was "we are the greatest nation on Earth, but we were still threatened by "evil forces." There was certainly a noticeable level of national regret and sorrow over some of the darker pages in our history, but the emphasis was on the idea that "those days are over" and "we're not like that anymore."