Why were spices expensive for europeans

What was the effect of peace in europe after 1815

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.

In what primary way did the goals for us intervention in europe differ from those of the soviet union