"I definitely agree, and this problem is not limited to what we consider (or considered) repressive regimes.."

I think the very best example of this (major, shocking news event unknown internally by US citizens) is the Iran Air flight 655 incident, wherein a US Navy cruiser shot a civilian airliner out of the sky, killing 290 passengers:

https://en.wikipedia.org/wiki/Iran_Air_Flight_655

This airplane was flying in Iranian airspace. The Navy cruiser was in Iranian territorial waters.

You don't run into too many people in the US that know about this ...

It is hard to know about all of the US incidents abroad that are fucked, because there are so many of them, and we make no attempt to hide them at an institutional level. (Other than those made during already classified operations, but those get out eventually because using classification to cover up mistakes/crimes is generally a much more serious crime)

In school I learned about Japanese internment during WWII, The 3/5ths compromise and the trail of tears, and a dozen other US atrocities. I hear about drone strikes against weddings in the news.

The point is there is no institutional censorship stopping me from learning about this stuff, like there is in China with regards to Tienanmen Square.

I never heard "we won Vietnam," except jokingly, going to a regular public school in the 90's and 2000's in the Pacific Northwest.

My dad always described Vietnam with a little head-shaking regret (he was born in Texas in 1957, so he was too young to be drafted, but we had family friends in the war). We didn't hear about it much in elementary school, but in middle school history classes we learned about the Gulf of Tonkin and the smoke and mirrors surrounding that, and why the war was so difficult and controversial compared to previous wars. In high school I had more in-depth modern American history class, studied the social repercussions of the war, the Kent State shootings, the protests, etc.

I'm not sure if it's the chronologic difference or the geographic distance, but not every schoolchild in the US learned "we won the war."

Absolutely, and as I said my story is obviously anecdotal (as is yours of course), and I was not implying that this was the case across the board or in every region or school.

You guys won Vietnam. You just didn't achieve the best possible outcome. Really, Vietnam had a thriving economy by that time, growing industry in several cities, but after the war the country was nothing for a really long time. You bombed them into stone age, so it didn't even matter whether the country was communist, democratic or whatever else at that point.

Even crazier how china tells its students that Chi a son their Vietnam war, when the PLA lost so many soldiers and failed to achieve their objective of getting Vietnam out of Cambodia.