You need to look it up. There were several wars between major powers which I named. And we had the US-Mexico war and the US civil war, and the Boer war in South Africa for a little sideshow action. Hardly a time of peace from 1818 - 1914.
Here’s link to a timeline of (some) European wars from 1521 to 1659. Almost continuous warfare.
The 17th and 18th centuries aren’t much different.
I suspect if we added up the number of war/years for major powers in these centuries, then compared them to the 19th, the 19th would be somewhere around 10% to 20%, which is what I meant by a period of “general peace.”
Comparatively speaking, that is.