What happened at lena goldmine in 1912 in russia?

LENA GOLDFIELDS MASSACRE. The Lena Goldfields Massacre of April 4, 1912, shook Russian society and rekindled the revolutionary and workers' movements after the post–1905 repression. The shooting occurred during a strike at the gold fields on the upper branches of the Lena River to the northeast of Lake Baikal.

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D. Slavery in the Americas relied on the ideas of racial superiority

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The reason being is if you look back in history, the white peoples were wealthy and thought of themselves as being superior to the African Americans. Thus, white peoples owning African American slaves to work for them with little-to-no pay and very little food.