During World War I, the United States made a windfall by this means. With the support of abundant funds, we began to vigorously develop the military industry and made some achievements in the military field and first-class weapons manufacturing. During the Second World War, many countries suffered heavy casualties.
Although the United States did not directly participate in the Second World War, it was precisely because it sold weapons and resources to other belligerents that the war intensified and people in many countries became victims. Taking advantage of World War II, the United States really made a lot of war money.
When more and more countries are involved in the war, the United States just sits quietly and counts money. Like many countries, ammunition and advanced weapons are sold at high prices. In fact, the fact that the United States can become a superpower is closely related to these two wars, but this is actually incorrect.
But for Americans today, will there be some sense of shame about this history? Only those who truly understand the war at that time, what the United States did and historical reasons will feel guilty about what the United States did.
However, if you don't understand this history and what the United States has done, you may not have much feeling and will not have much influence on yourself.