Your original statement was that the wars in "Korea, Vietnam, Afghanistan, Iraq, Libya and Syria, plus the various proxy wars it fought in Africa and South America during the Cold War" were major wars. I disagree with that, respectfully. The "11-12 million deaths caused by America" aren't within the necessary scope. WWII caused upward 50 million deaths directly, and several dozens of millions indirectly. I'm sure you consider the numbers comparably close within your own mindset of comparison.
You seem to assume an absence of war in europe is what I consider Pax Americana. You'd be dead wrong of course. What is important is scale. During WWII the entire world was at war. Europe was in ruins, large parts of asia were in ruins; and yes the USA, Australia and Africa, along with a string of colonies were drafted and forced to ration. By example more than a million Indians died in WWII because Winston Churchill shipped their food right out of Bengal. They starved to death.
Certainly, I exagerated when I said the "system came to a halt". Then again, I'm also certain the utilities of a hyperbole in rhetorics passed you right by.