History contains a lot more peaceful trade and cooperation than it does war. You know how they say “history is written by the victors”? There’s truth to that, but I’m much more a fan of “history is written by those who wrote it down.”

Now that sounds kind of nonsensically tautological on its face, but there are two main takeaways to this: it was only written by the people who and the means and the ability (usually rich and/or educated people which definitely has an impact on history) and they only wrote it down if it was noteworthy. So you might get some forms of record keeping when it comes to commerce, but by and large if things were uninteresting and just another day in the life then nobody would be too inclined to make a record of it.

War, by its very nature, is very disruptive and noteworthy. You can see how people would be more inclined to make a record of it, to say nothing of the literary works that it can inspire.