The answer is letters and artifacts
Answer:
In Europe, the United States developed and accomplished an economic recovery plan for Western Europe after WWII that was highly successful, the Marshall Plan. It helped Western Europeans rebuild their economies and laid the basis for prosperity. In the late 1940s, it was feared that poverty and deprivation may help the Soviet Union spread communism.
The US also used military and diplomatic means to contain the Soviet Union´s influence. Together with its allies, it created NATO to oppose the Soviet military might that intimidated Western Europeans. It also ran an airlift when the Soviets blockaded West Berlin in 1948.
In Asia, the United States intervened militarily and diplomatically in Korea in 1950-53 to stop the North Korean invasion of the South. It saw the move as part of a well elaborated plan of Moscow to expand communism in Asia. The containment doctrine had already been adopted and it motivated the Truman administration´s response in Korea. China had fallen into communist hands in 1949; the US had supported the Nationalists of Chiang Kai-shek until the end. In the 1960s, the USA got involved in Vietnam for the same reason: to stop communist expansion.
Explanation:
Capitalism calls for the expansion of the figurative market that controls the global trade. In simple terms, capitalism made trading thrive. With global trading access, nations will have less of a concern for its population, and rather focus its economy on relevant subjects(like war).
Think of it like pie baking:
A group of pie enthusiasts can only consume pie, and they need the necessary ingredients for the pie. Some of them might have more dough than their other ingredients, so they need to rely on others for eggs, fillings, milks, etc. But coincidentally, the people that gives the ingredients also needs dough, so they trade, resulting in everyone being able to bake pies.
In real life, countries often rely on other countries for food source, material supplies, and labourers. Your computers are made out of minerals mined from the congos and Argentina, engineered in Germany, manufactured in China, processed in Vietnam, and finally sold to you as a western consumer.
Thus, capitalism creates global trades; accounting for the development of human kind.
Hope this helps!