The Monroe Doctrine was largely a response to:A. fighting between western settlers and Native Americans. B.the debate over admitting slave states to the Union. C.the need to strengthen the national economy despite sectional differences. D.the interest of European nations in creating colonies in North and South America.

i'm asking the same thing i asked this other cat all of

can someone me with this question:  

1) the end of the conflict between the north and the south didn’t just mark the end of a war; it marked the end of an entire way of life.” which statement best describes what this statement means?  

a) the southerners were no longer free and were controlled by the northern states.

b) the industrial economy in the north was not sustainable.

c) slavery became illegal, which changed completely the south’s labor force and the agricultural economy was destroyed.

d) the states decided to relinquish their independence and return to britain’s rule.    

the colonial period, since this was a time of mass immigration from a variety of people from europe.