All males between 18 and 25 must register for a potential draft.
Males between the ages of 18-25 are still required to register so a draft can quickly be put in place if needed, but the military service in the US is strictly voluntary at this time.
Answer:
Most 18th century Americans lived in self-sustaining rural communities. The Industrial Revolution witnessed the evolution of large urban centers, such as Boston and New York City, and spurred a massive internal migration of workers. The Industrial Revolution also stimulated the rise of unskilled labor.
