In the history of events in russia in the 19th and 20th centuries, the slogan "one language, one church, and one ruler" refers to a czarist program to bring about
democratic reforms
self-determination
russification
communization
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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.