During the summer of 1862, lincoln concluded that emancipation had become a political and military necessity. many factors contributed to this decision.
which of the following are factors that led lincoln to issue the emancipation proclamation?

a. lack of military success
b. hope that emancipated slaves might meet the army's growing manpower needs
c. changing northern public opinion and the calculation that making slavery a target of the war effort would counteract sentiment in britain for recognition of the confederacy
d. all of the above