Answer:
Massachusetts
Explanation:
Massachusetts was the state that argued that the slaves should be allowed to join the Union army. This was also significant for the slaves as it is believed in some circles that it was the end to slavery which led to the war. Also, the 54th Massachusetts infantry unit did induct slaves as soldiers in 1863. Hence, Massachusetts is the right answer to this.
It means the president is chosen by which has the most percentage of the population voting for them
