Every country has been "colonized". The "Native American" wasn't. They came from Asia across a land bridge from one direction and as explorer Vikings from the other. Slavery existed here centuries before the Europeans showed up. It existed everywhere. On every continent throughout history. It still exists even after all the UK and the US Northern states did to abolish it. There is a group still enslaving people today and those on the left embrace them.
You don't know they aren't, you just hope. History, recent and long term point to one occurrence over the other. Mostly peaceful as long those they rule do everything they want. The non Muslim inhabitants of Iran do what they are told or die. The recent purge in Iran where the government killed tens of thousands in the space of a few days is one of the most recent. There have been many thousands of Christians beheaded, shot, locked in churches and burned alive this century alone. Assuming it won't happen everywhere is a mistake.
