I believe it is D. Tsar Nicholas II gives up the throne.
He abdicated in 1917. Before Lenin and the Bolsheviks seize power. A year later, in 1918, the civil war breaks out where the Reds prevent the Bolsheviks' reign.
A. The Europeans brought diseases like smallpox, and many Native Americans died.
1830 Congress, urged on by President Andrew Jackson, passed theIndian Removal Act which gave the federal government the power to relocate any Native Americans in the east to territory that was west of the Mississippi River.