PLEASE HELP ASAP!! Why is nullification a concern for the federal government?

1. Because it allows states to overrule the power of the federal government

2. Because it encourages lawmakers to seek council of other countries

3. Because nullification takes power from the states and brings it back to the federal government.

4. Because it forces citizens to have soldiers in their homes

what was the significance of the plessy vs ferguson ruling and jim crow laws

answer the impact. plessy v. ferguson allowed 'separate but equal, also known as segregation, to become law in the united states

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.