Schools in some states aren't allowed to discuss any topic that creates "discomfort, guilt or anguish on the basis of political belief." Which means they can't teach about slavery or manifest destiny or any other aspect of American history for which an honest, critical look might make white people uncomfortable. Texas even wanted to mandate that 'slavery' be referred to as 'involuntary relocation' and slaves themselves as 'workers' in textbooks, and Texas teachers are forbidden by law from teaching that slavery was part of the founding of the US, they can only teach that it was a "deviation from American values."
And the confiscation of indigenous land and forced expulsion of those people ...
And state constitutions which prohibited Blacks from moving in ...
Institutionalized Jim Crow-era race-based restrictions, including Sundown Towns and redlining...
The forced expulsion of Chinese-Americans from Tacoma, by white supremacists including the mayor, judge and city councilors, which became the method used to further Chinese expulsion in the US West.
Oh, and the Japanese detainment camps in WWII ...
Nope, no history of oppressive governments in the US.