Which term describes the system of enforced militay service instituted in the north?

The term that describes the system of enforced military service instituted in the North during the Civil War is "conscription." This practice, also known as the draft, required eligible men to serve in the military, particularly as the war intensified and volunteer numbers dwindled. The Conscription Act of 1863 was a significant legislative move that formalized this system in the Union states.