I can illustrate this with a calculation I've used before from the war on Vietnam.
The U.S. soldiers who did 1.6% of the dying, but whose suffering dominates U.S. movies about the war, really did suffer as much and as horribly as depicted. Thousands of veterans have since committed suicide. But imagine what that means for the true extent of the suffering created, even just for humans, ignoring all the other species impacted. The Vietnam Memorial in Washington D.C. lists 58,000 names on 150 meters of wall. That's 387 names per meter. To similarly list 4 million names would require 10,336 meters, or the distance from the Lincoln Memorial to the steps of the U.S. Capitol, and back again, and back to the Capitol once more, and then as far back as all the museums but stopping short of the Washington Monument.
Now imagine multiplying by 3 or by 5. The U.S. percentage drops to a tiny fraction of 1% of the deaths in a one-sided slaughter.
Of course this also puts into perspective those disgusting claims that U.S. gun deaths domestically are higher than deaths in U.S. wars or that the deadliest U.S. war was the U.S. Civil War. Statistically, virtually all deaths in U.S. wars -- including U.S. proxy wars undiscussed here -- are non-U.S. deaths.
Now imagine putting all the war deaths, direct and indirect, into one memorial wall. Perhaps it would cross the continent.
For a broader consideration further back in time, see https://davidswanson.org/warlist
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