Answer:
Requires the approval of 2/3 of the states and 2/3 of congress.
The answer for this question is: A. <span>For Northerners it redefined the war as being about slavery.
The emancipation stated that all people that held as slaves within rebellious states are henceforward shall be free. This put a mindset in northern soldiers that they joined the war in order to abolish the slavery system that still held by the southern states.</span>