The division of Europe into two different parts i.e. East and West was one of the negative political effects of the World War II. World War II happened from 1939 to 1985.
Unjust Treaty of Versailles, Inaction of the United Nations, Disarmament failure and Rise of Hitler were the main reasons of Second World War. The First World War put an adverse effect on the economic situation of many countries although the European economic state was in a very good condition till 1920.
After World War II, USA President Harry Truman announced financial help to the countries who participated in the war and prevented the effects of Communism. This declaration is called Truman's declaration.