Because of scale I am pretty sure
The statement which is true of the Truman Doctrine was that it amounted to an informal declaration of the Cold War. The Truman Doctrine actually contained containment as it was a policy to stop communist expansion from the Soviet Union. The countries where Truman tried to stop this and the countries often referred to when speaking about the Truman Doctrine were Greece and Turkey.
President of the United Mine Workers of America (UMWA) from 1920 until 1960 and founding president of the Congress of Industrial Organizations (CIO), John Llewellyn Lewis was the dominant voice shaping the labor movement in the 1930s.
It would be that the "The equal-field system gradually fell into disuse in Japan," that was not a reason for the decline of the Heian dynasty in Japan, since this system remained somewhat intact.