Why was April 30,1812 chosen for Louisiana to officially become the 18th state of America?

There's no specific reason that that specific date got chosen. It's just a factor of time, resources and randomness that April 30 got chosen.

Explanation:

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assessment is the missing word

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.