The attempt to stop communism from spreading to Greece and Turkey after World War II was due to the Truman Doctrine.
The Truman Doctrine was a law proposed by US President Harry Truman. His goal was to stop the spread of communism (also known as containment). To ensure that Greece and Turkey (which are close to the Soviet Union) did not fall under the control of a communist nation, the US agreed to give $400 million to these countries. The goal was to help these countries recover from World War II as well as develop a political and economic alliance.
The main reason why revolution swept so many African nations following their independence from European rule was because there was a giant power vacuum that needed to be filled--usually by a dictator.
Germany, Austria-Hungary, Turkey, Ottoman empire and Bulgaria were the central powers. These were also known as the quadruple alliance.
There were many areas where the US used an economic blockade. This is also known as an embargo, usually used to weaken a country at war. It gave several controls with assistance, ties, trade, and financial transactions are restricted.
The US used this in Cuba, which gave pressure to their economy. Iran, Sudan, North Korea, Russia.
During the cold war it made an economic blockade with