A cause and effect due to process of elimination and the text
The Truman Doctrine was an American foreign policy whose stated purpose was to counter Soviet geopolitical expansion during the Cold War. It was announced to Congress by President Harry S. Truman on March 12, 1947, and further developed on July 12, 1948, when he pledged to contain threats to Greece and Turkey.
D.India experienced political unrest for many years
The Aztecs and Cortes were ruthless killers. (for multiple reasons)
The civil service system is much better than the alternative, which was Patronage. as implemented by the Hoover Commission. Civil service sets employment competence standards for hiring and makes working a permanent career, not just until the next election. it was so outstandingly successful, that virtually every state and community government follows it to large extent.
