What was the purpose of the american system?

a) to strengthen the power of the federal government and to dissolve the three regions and encourage nationalism

b) to strengthen the economy of each region while ensuring that the federal government would remain strong

c) to strengthen the western economy and ensure that the northeast maintained control of the federal government

d) to ensure the rights of slave owners in the south to buy and sell slave throughout the nation

I think it is C

alliances in ww1 were different from ww2 because the entente in ww1 made up of serbia,russia,france,britan,japan and italy later america  and all allied in a sort of balance of power and too keep germany,austria-hungary,and the ottomans down. russia allied the serbians in order to exert its influence in the balkans while france allied the russians because france was still in dismay and insulted after the defeat to the germans during the unification of germany and britian allied the belgians after the germans invasion of belgium.in ww2 the alliances were in a preemptive attempt to deter any further wars into happening while germany and italy allied since they were insulted and humiliated after the previous war while also sharing a similar ideology of facsim along with japan which all 3 had a want for world domination and agreed to assist one another in the endevours 

explanation:

he sent troops to protect the students as they entered the school.