What causes of the Russian Revolution were related to WWI and how do you think the Russian Revolution affected the length and outcome of WWI?

From which of the following literary works is this quotation most likely taken?

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more. b-it made cross-country travel too expensive for ordinary americans. c-it decreased the safety of americans who moved to settle the plains. d-it shortened travel time between the east and west for all americans.

The american civil war most former enslaved african americans in texas began making a living as