Comment by dragonwriter

That's really not true if you look at the European neighbors and European territories of Russia and the Ottoman Empire.

Also not true of Spain, which spent a lot of time in internal warfare (with occasional outside interventions.)

But, yes, excluding those, most of the countries in Europe were too busy fighting endless wars throughout their (or their allies’ or enemies’) colonial empires (whether to expand them, defend them, or put down or assist rebellions in them) to bother fighting other powers in Europe in that period.