Interesting you should mention the two world wars.
The first was a good example of a war which the USA should never have involved itself in, and in my opinion, our involvement in only made these worse in Europe over the subsequent decades.
The second, of course, we had no choice after Japan’s sneak attack on December 7, 1941, and Germany’s declaration of war on December 11, 1941.
European wars are dangerous for all living things.