Following WWII, the United States and the Soviet Union were the two most powerful nations in the world. WWI devastated Europe with many lives being lost as well as destruction to the landscape. WWII was even more destructive, both economically and politically exhausting great nations like France, UK, and Germany. Stalin, Roosevelt, and Churchill met at the Yalta Conference in 1945 to discuss the situation of postwar Europe. This later lead to a separation of Eastern Europe, (which went into Soviet hands) and Western Europe which America financially aided and sent supplies to to help rebuild.
Carnegie created a monopoly and he did this by investing in new technology which helped him grow his steel corporation. He went to other factories took their ideas and incorporated them into his. He also bout other companies that would help his own companies. In growing his monopoly he used vertical integration, he combined all of his companies into one large one which he named Carnegie Steel. He had the raw materials, his own manufacturing sites and steel mills and a way to transport his product. This is vertical integration, get the materials, make the steel, and ship it.
A. Transcontinental railroad