I graduated high school like 15 years ago, so I'm outdated.
My AP US history experience was as a student at a private school. My teacher primarily lectured from notes she took during classes while at college. We seemed to spend an excessive amount of time on the Civil War because it interested her. No, we did not focus on slavery. We talked about states rights. When it came to the world wars the questions were about isolationism and nationalism.
I can understand where US history might look like one injustice after another, but that's the history of any country. (Legislators would never make laws if everyone thought everything was fair.) America is in a way founded on injustice. Pilgrims fled to America due to religious intolerance and countless others for what they believed would be better opportunities than they were given at home. The revolution was brought about due to the perceived "injustice" of taxation and poor representation. The civil war was about the "injustice" of thinking federal rule should stand above state rule. The world wars were about the "injustice" of challenging sovereignty. In all cases somebody stood to gain and somebody stood to lose. Those who incurred injustice are just the losers during any particular era. Pilgrims, revolutionaries, slaves, resident Japanese, etc. It's a nation of immigrants and they were all persecuted at some point.
But to give the whole history of the US according to them would be disingenuous. It would be like saying that the millennium should be remembered as the era religious war escalated from a regional conflict into a worldwide conflict. The bigger truth is that globalism and the age of information dawning at the turn of millennium meant that ideological conflict no longer had borders. Power, money, and belief have always been the real agents of history.
If anything the shortcoming of US history is that it discourages historians from putting the appropriate focus on the world context. America exists because of people leaving Europe. Slavery exists because it was cheap labor from Africa. The goods traded were dictated by the supply and demand all around the Atlantic Ocean. Japanese internment was a response to World War II and the fact that more Europeans held trusted positions in America than Japanese people did because they did not have as strong of a history of immigrating. All of these things led to some unfortunate circumstances for various communities, but the reason is typically understandable whether or not you personally agree with it.
I get uncomfortable when people view history as a series of rights and wrongs rather than a series of complicated decisions and interactions.