In the early 1900s, after the bolsheviks began to rule russia,
a. the tsar and his family left russia for germany.
b. the fight for power resulted in a three-year civil war.
c. the treaty of brest-litovsk was no longer honored.
d. the white army declared support for the bolsheviks.

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.

battle of saint-mihiel, (12–16 september 1918), allied victory and the first u.s.-led offensive in world war i. the allied attack against the saint-mihiel salient provided the americans with an opportunity to use their forces on the western front en masse.

explanation:

they were byzantines