Briefly describe the formation process of the world pattern with the United States and the Soviet Union as its poles.

After the end of World War II, world powers began to redraw the world map and sphere of influence according to the basic principles established by a series of important international conferences such as Yalta, and established a new pattern of international relations, namely the Yalta system.

The Yalta system marks that the traditional international pattern centered on Europe has been replaced by the bipolar pattern of the United States and the Soviet Union, and international relations have entered a new era.

In the early post-war period, the bipolar pattern between the United States and the Soviet Union began to take shape, based on the Yalta system. The curtain was the "Iron Curtain Speech" by British Prime Minister Churchill, and "Truman Doctrine" became the symbol of the full-scale outbreak of the Cold War. The establishment of the 1955 Warsaw Pact marked the final formation of the bipolar pattern of confrontation between the two major military and political groups of the United States and the Soviet Union after the war.