The emancipation proclamation affected the union's civil war efforts by?
1) allowing the union to turn its attention away from slavery
2) increasing the number of troops who could join the union
3) forcing southern slaveholders to free enslaved people (not the answer; already tried)
4) forcing northern african americans to join the union army

2) Increasing the number of troops who could join the Union.

Explanation:

The Emancipation Proclamation was an executive order issued by Abraham Lincoln on January 1, 1863. This order stated that when a slave escaped the control of the Confederate government, either by running away or by advancement of the Union troops, the slave became free. Eventually, when the Confederate Army surrendered, this emancipation applied to all slaves. The proclamation allowed more people (former slaves) to join the Union and help in the war.

what the first or next guy says

the reform movements that arose during the antebellum period in america focused on specific issues: temperance, abolishing imprisonment for debt, pacifism, antislavery, abolishing capital punishment, amelioration of prison conditions (with prison's purpose reconceived as rehabilitation rather than punishment), the humane treatment of animals, the humane and just treatment of native americans, the establishment of public institutions for the care of the destitute, orphans, blind, and mentally ill, the establishment of public schools, the abolition of tobacco use, vegetarianism, health reform, homeopathic medicine, woman's rights (including, at first, especially the establishment of a woman's right to own property apart from her husband and her right to sue for divorce), and the amelioration of labor conditions (including higher pay, the right to form unions, the right to strike, and the demand for limits on the number of work hours, and safe working conditions).

explanation: