Nationalism was a secondary factor in WW1 (the elites failed in their alliances, and later used Nationalism as a recruiting tool, but it was not a driver), and was not related to Bosnia and Rwanda which were ethnic wars.

I think you have a misunderstanding of what the term 'Nationalism' means.

WWI was caused by the anglos exploiting their colonial holdings so effectively they were existentially threatening the Germans. Etc.

We can write anything on the Internet. Perhaps you could provide some basis?

For other people reading this, that's such a fringe statement that I've never heard it before. To me, it looks like standard victimhood rhetoric.

So Germany invading France because 'fear of the UK' is the fault of the UK?

Please. It was a powder Keg, and notably, Germany 'started it'.

USA already had its genocidal expansionist moment as a nation before the great World Wars. An entire continent ethnically cleansed and replaced with Anglo settlers. Of course, there was no one to hold it accountable as with the Germans and Japanese. This greatly inspired 20th century fascist thinkers around the world, including Adolf Hitler.

Lebensraum, spazio vitale, manifest destiny.

Even ignoring that, if "nationalism" does not include the massive public projects and social cohesion of 1930s-50s USA, then frankly you have a bizarre definition of nationalism.

More outrageous, aggressive claims, that somehow it's up to me to address. It's up to you to establish them; otherwise, it's just some words.

It is a basic fact that the virtual entirety of North America was ethnically-cleansed and settled by Europeans in the last 500 years.

If you say it's a 'basic fact', who can disagree?

That is indeed how facts work.