What other big changes were taking place in the world around the time that the wealth of nations was published ?

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.

Who founded the social contract theory of the government

How did the industrial revolution give an advantage to industrialized european nations over non-industriallized nations?