Answer:
a) because he considered emancipation to be "a military necessity, absolutely essential to the preservation of the Union."
Step-by-step explanation:
President Abraham Lincoln was born on the 12th of February, 1809 and was the 16th president of the United States of America. He served from 1861 to 1865 in an active capacity.
On the 22nd of September, 1862, President Lincoln issued an executive order during the Civil War, which was known as the Emancipation Proclamation or Proclamation 95.
Abraham Lincoln wrote the Emancipation Proclamation because he considered emancipation to be "a military necessity, absolutely essential to the preservation of the Union."
He issued the Emancipation Proclamation to set all persons who were held as slaves in the rebellious states free. Also, he declared that the military and naval authorities, as well as the executive government of the United States of America shall recognize and uphold the freedom of such individuals.