The Correct Answer Is:
Hawaii became the 50th state in August, 1959, following a referendum in Hawaii in which more than 93% of the voters approved the proposition that the territory should be admitted as a state. There were many Hawaiian petitions for statehood during the first half of the 20th century.
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-Austint1414
The main way in which the US became a world power while Roosevelt was president was that they entered World War II, which led the US to begin manufacturing war materials at a rapid pace--leading to a sudden and sharp rise in employment and GDP.
The enemy was a disease that had spread throughout the camps killing over 11,000 soldiers.