This timeline shows the leaders of the Soviet Union and when they ruled starting with Kerensky, the head of the Provisional Government, and ending with Gorbachev in 1991 when the Russian Republic was formed. http://www.rff.com/timeline_soviet.htm
A. No other place or country has control over a state.
1980 was the time at the end (but people didn't know that) of the Cold War, that is the conflict between Capitalism and Communism,
US had a capitalist system and was actively involved in stopping the spread of Communism in Asia and Latin America and this is also the correct answer: stopping the spread of Communism.
Some of this energy will be converted into heat due to the friction between the molecules in the microphone. ... The speaker components that move will gain some heat energy in the process. Finally, the medium through which sound travels, be it air, water or something else, will actually gain heat from the sound.