What Europe suffered in its World Wars dwarfs America's sufferings in those wars.
The Civil War, especially the South's experience, better mirrors Europe experiences in its World Wars. Whole cities demolished. Farmland devastated. Bankruptcies, famine, disease, enemy occupation, and massive casualties, both military and civilian.
Back when having two large oceans between us and the fighting actually meant something.
And while Europe suffered more, many/most of them recognized (and still do) the sacrifices our troops made. Even today they have cemeteries filled with our dead that are well-kept and honor ceremonies held each year.
I’m not sure how much we helped in WWI (maybe just enough to bring the German’s to the table - but IMHO I think the pandemic was the main factor in ending the war) - but they would have lost WWII without us.
That's because the Europeans were the cause of, and started both World Wars.