Imperialism didn't have a huge role in sparking world war one. It was really assassination of Archduke Franz Ferdinand and his wife.
President Hoover responded cautiously to the Great Depression because he "A. thought that the business cycle would correct itself," mostly because it was impossible at that point to know the extent to which the depression would develop.
Answer:
Australia and Northern Asia
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Iran was ruled by a constitutional monarchy under Mohammad Reza Pahlavi, Iran's Shah (king).