Some factors include: natural resources, immigration, government, entrepreneurs and inventors. It led to rising standard of living, improvement of transportation, and growing populations.
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Https://www.globalsecurity.org/military/ops/vietnam2-opposition.htm
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I believe that the answer for this is option B. Since there is an advocate given for a limited government, this would most likely contradict the modern American bureaucracy for the reason that the shift of bureaucracy is too much that the federal power between the President to the Congress becomes imbalance.
C. The Iran Hostage Crisis
Australia is a Federal Country. The country is known to have a powerful central government, and has states/provinces around it that are provided with sufficient self-rule. However, it's still the central government that rules above all matters in Australia.