(1) The Soviet Union controlled the "heartland" but failed to dominate the world. ( 1)

(2) After the victory of the world anti-fascist war, in order to control China, the American government fully supported Chiang Kai-shek to launch a civil war.

(2) 1948, the United States began to implement the European Renaissance Plan, that is, the Marshall Plan.

(3)1949, representatives of 12 countries, including the United States, signed the North Atlantic Treaty Organization and established the North Atlantic Treaty Organization.

④ From 1950 to 1953, the United States intervened in the Korean War.

In the early 1970s, the United States and China normalized their relations. (Give 6 points for answering 3 items correctly above)

(1) The theory of British scholars is facing the international form at the beginning of the 20th century. At that time, the world was centered on Europe. In 1930s, American scholars lived in an era when the central position of Europe was gradually weakening, and his theory reflected the political ambition of the United States to some extent. (2) It is required to combine the edge of the "heart zone" with the "Eurasian coastal area" for analysis. For example, the relationship between the United States, China and Western European countries embodies this theory.