The US education system is inconsistent, so you can't really generalize. I love America, but I'm also aware of its flaws and don't have any illusions about it being perfect or anything like that. I was also taught plenty of material about the darker sides of American history: slavery, mistreatment of natives, etc. Similarly I learned a lot about 'family health', science, etc. However some schools might lean more towards non-scientific teachings or leave out unsavory material depending on what school you inspect.

Your tone makes me wonder if you're German; having studied German for many years, we learned about how Germany has somewhat of a complex around country pride given certain historical events. My school system had people from over a hundred countries and love for your country was almost universal, including to the extent of wearing clothing with the national flag on it like some Americans do

Local history curriculums never push into anything that would be politically uncomfortable locally.

This is usually done by requiring certain things be taught in great detail in order to preclude time being spent on other things.