George C. Marshall was important in world history largely because of his role in creating the Marshall Plan. This plan helped to tie the United States to the countries of Western Europe in ways that continue to be important today.
Marshall was also a military man. In fact, he was the Chief of Staff of the US Army during World War II. This meant that he was the highest-ranking solider in the Army during that war. However, this is not what he is most famous for. Instead, he is more famous for what he did after the war.
After the war, Western Europe was devastated. The economies of the countries were in ruins because of the war. This meant that people faced very hard economic times. The fear was that these problems would lead people to prefer communism to democracy and capitalism. In part because of this, Marshall proposed the idea of massive American economic aid to Europe. This was the Marshall Plan.
The Marshall Plan was important in part because it helped to rebuild Western Europe, a region which remains an economic powerhouse even today. Second, it was important because it forged strong ties between the US and the Western European nations. This relationship has weakened to some degree, but it still remains pretty strong. This is the main reason why Marshall has been important in world history down to the present.