There are many dark/evil events that occurred in America. What was the most EVIL event in your country's past? Why THAT choice?

Most of what you mentioned is a non issue. You show complete lack of perspective and ignorance of history.

Native Americans were not all peace loving. You are grossly oversimplifying the history. Some of the tribes were barbarous as hell. The U.S. behaved shamefully, but so did they. The Comanche were f***ing savages. 

The McCarthy hearings were not significant. They may have been a bit paranoid and overzealous about finding leftist scum, but there is nothing "evil" about it.

Even criticising slavery lacks perspective. You are criticising a time when slavery was widespread all over the world. So there is nothing specifically American about it. The U.S. was one of the first to abolish it.

Japanese internment was not a big deal. It was a necessary security measure during WW2.

In my opinion the most evil act in U.S. history was the Tuskegee experiment. 

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

Though that's just what we know about. The deep state runs black ops like that all the time most of which we'll never know about. The only reason the system lets information like Tuskegee come out is so that people like you can be influenced to hate your country. It's part of presenting the age of globalism as more enlightened. This post was edited by Zeitgeist at April 24, 2018 4:58 AM MDT

Canada might be able to match that and maybe it's even a little eviller because it happened in a modern day society not a new world frontier. In the early 1950.s Canada needed a settlement in the Artic Circle so that Russia  couldn't claim it. So the Canadian government cut off funding and made fishing and hunting laws that would make it very hard for the Inuit people to live in their area. Then the government promised the Inuit a new bountiful hunting ground with newly build homes and supplies then they migrated the Inuit to the Artic Circle .  When they got there - there   was only a few tents and a few supplies - allergically the Canadian Government didn't care if the Inuit lived or died frozen or not they were still a human flag pole and Russia couldn't  claim that area.  But the Inuit did survive and when the Inuit started to prosper the Canadian Government sent in the Royal Canadian Mounted Police and they demanded taxes and that the Inuit follow all Canadian laws. The Inuit refused and then allergically the R.C.M.P took away their hunting rifles and slaughtered there sled dogs. If you google  `Inuit forced migration` or `RCMP sled dog massacre`you can find more info about it. If you want to hear some real funny and strange music google Inuit`throat Songs`. Cheers!

Aboriginal genocide. Unlike the Native Americans, who were a warlike people and well able to defend themselves (it was disease, alcoholism, diversion of waterways and extermination of the bison that almost wiped them out rather than open warfare) or the Maori (defeated by cheating on a signed treaty), the Native Australians were not accustomed to internecine warfare, still used stone age technology - and were hunted like vermin. Wiped out completely in Tasmania.