I think you know what I mean. In the US, it’s pretty common to discuss how we stormed the beaches at Normandy, how we advanced across the Pacific, and how it wasn’t over when the Germans bombed us at Pearl Harbor.
Going further back, it’s not uncommon to hear about how we (say) fought the bloody British in the town of New Orleans–a conflict of which noone alive today could literally say we when discussing America’s participation in that war.
And even in less savory circumstances, we straightforwardly talk about how we wiped out the Indians in most regions and how we intervened in Central America in the early 20th century.
People might debate whether we were justified to do such and such, or whether we really did such and such, but I don’t recall hearing anyone say, “that wasn’t us, that was another generation of Americans that that have nothing to do with us and can’t be included in our first person plural pronoun.”
Is this common in other countries? Do Brits talk about how we gave those pygmies a sound thrashing at Mboto Gorge? Do the Germans talk about how we were turned back at Stalingrad?