(A) USA entering the War
(B) ** The overthrow of the Czar
(C) The Ottoman empire entering the War
(D) Germany captured St. Petersburg
EXPLANATIONS BELOW
Concept note-1: -In October of 1917, Lenin took full control of the government in what is called the Bolshevik Revolution. Russia was now the first communist country in the world. After the revolution, Russia exited World War I by signing a peace treaty with Germany called the Treaty of Brest-Litovsk.
Concept note-2: -Lenin believed that Russia must end its participation in the war so that the nation could focus on building a communist state based on the ideas of Karl Marx, a German philosopher who lived in the mid-1800s.
Concept note-3: -The Russian Revolution toppled the Romanov dynasty, and Nicholas II abdicated on March 15, 1917. The royal family was arrested by the Bolsheviks and held in seclusion. On July 17, 1918, the Bolsheviks murdered Nicholas, his family, and their closest retainers.
Concept note-4: -Ineffective leadership and a weak infrastructure during the war led to the demise of the Romanov dynasty. Ineffective leadership and a weak infrastructure during the war led to the demise of the Romanov dynasty.