How did the north increase their armies in 1863?

In 1863, the North increased its armies primarily through the implementation of the draft, officially known as the Enrollment Act, which mandated military service for men aged 20 to 45. This allowed the Union to significantly bolster its ranks as many eligible men were conscripted into service. Additionally, the North continued to recruit volunteers and incentivized enlistment with bounties, further enhancing troop numbers as the war progressed. The combination of conscription and volunteer enlistment helped sustain the Union's military efforts during critical phases of the Civil War.