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Answer: 1959</h2>
Explanation: They were admitted to the union in 1959.
To cause a source to be biased means that it is influenced by your opinion or another factor that is not factual. Bias can take away from the credibility because it is not completely true, as a source should be.
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In WW1 Japan was a growing empire trying to take more land and get more resources to become a world power. Imperialism is the main reason they entered WW1.