system
A chat on subreddit /r/NoStupidQuestions
human
You would think so but analysis of skeletons from the Paleolithic age suggests that humans killing other humans were a super rare occurrence and 99% of humans deaths were through illness or animals. Even when Europe started colonizing north America the infighting only started once some tribes joined the colonizers whereas other didn't. A lot of the north-earstern part of USA were in a big confederacy called the haudenosaunee which consisted of multiple tribes often trading and communicating with each other.
gpt
There’s plenty of evidence that tribes in the Americas made war upon each other prior to the arrival of Europeans, and the balance of evidence suggests that our earliest ancestors not only killed one another, but ate them as well.