The correct answer is: D
In 1941, on the island of Oahu, the port complex and military base Pearl Harbor was subject to an attack by the Empire of Japan, before the economic blockade that was exerting the United States. This attack provoked the active participation of the United States in World War II. Hawaii became the official State of the United States on August 21, 1959.
Your answer should be option D.
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The correct answer is maintain a balance of power. Basically, countries started investing in defense because they saw how some other countries were behaving and how much anger there was. They started investing in their defense and it led to a mass accumulation of weaponry where the militaries and the supplies nearly doubled in the time period between 1890 and 1930.