My biggest reaction when watching these videos was seeing people tell firsthand accounts. The fact that Native American children who were taken from their families and "adopted" are still alive today to tell those stories shocked me. Seeing all of the dates of events from 1950 onward surprised me. I had learned about a few of these things in school--Japanese Internment (which I knew was in the 1940s), forced sterilization of Black women, Native American assimilation--but it felt like since I was learning it in History class it was a very long time ago.
Knowing that people alive today have these memories or were speaking of their parents, just one generation up, made it so clear how recent everything is, which makes it blatantly obvious that this is still happening, and has to still have an effect today.
I also had no idea that Latin American immigration was made illegal so recently, and people became "illegal" immigrants who were already in the country just because that law was passed at that time.