
An undertaking that Oliver Stone sees as his greatest achievement so far, The Untold History of the United States is a monumental history of the last 100 years of American Imperialism and the national security state, from the late nineteenth century through to the Obama administration.
Oh come on, you cannot seriously believe that. Anyhow, I recommend you watch 'The Untold History of the United States' by Oliver Stone [0]. He has done a great job of telling people the stories that are not told in your history classes.
Here are some other horrors that also don't get much coverage:
1837 - Lovejoy - torch-carrying mob murdered him for being an abolitionist https://youtu.be/Clu4lD7A1t8
1857 - Mormons murdered non-Mormons https://en.wikipedia.org/wiki/Mountain_Meadows_Massacre
1863 - Draft Riots https://youtu.be/1bxnUh86RB8
1866 - New Orleans massacre https://en.wikipedia.org/wiki/New_Orleans_massacre_of_1866
1871 - LA Chinese Massacre https://youtu.be/nauaIbOXaYo
1885 - https://en.wikipedia.org/wiki/Rock_Springs_massacre
1886 - https://en.wikipedia.org/wiki/Haymarket_affair
1919 - Red Summer (anti-black violence) https://youtu.be/Hy3a6PvIcxI
1923 - Rosewood massacre (anti-black violence and dispossession) https://en.wikipedia.org/wiki/Rosewood_massacre
1925 - ~40,000 KKK members march in Washington, DC https://youtu.be/BnI8SUQPB4k
1932 - Bonus Army - see: [0]. Hoover ordered Patton and MacArthur to throw out destitute veterans, women and children from peacefully protesting in DC to get their promised war pay earlier. They charged them by force. It was more benign that a veterans's Occupy Wall St. Two veterans were shot to death, a boy was killed and a pregnant woman miscarried after the police stormed a hospital with tear gas. https://en.wikipedia.org/wiki/Bonus_Army
1930's - Murphy Ranch / Silver Shirts - Nazis prepared to takeover America and round up the Jews
https://en.wikipedia.org/wiki/Murphy_Ranch
https://en.wikipedia.org/wiki/Silver_Legion_of_America
References:
0. The Untold History of the United States by Oliver Stone
EDIT: Here is a first-hand account of the conditions the Spanish empire brought to the Americas.
https://en.wikipedia.org/wiki/A_Short_Account_of_the_Destruc...
Speaking of history and the Cold War, a worthy docuseries to face some uncomfortable facts of the US' post-WW2 behavior: Oliver Stone's Untold History of the United States. Even Gorbachev wrote an opinion on the subsequently-released book.