The answer is d. there was a long process at Ellis island
To be honest. This is why the civil war happened. Some people may have lived in the free states, but Most people fought for their beliefs. Hope I helped.
We have GPS guided missiles big enough to knock out entire city blocks and can see you with infrared or night-vision cameras 30,000 feet in the air and rain down 30mm cannon rounds at 3,000 rpm or fire a volley of incendiary missiles and burn you out of the trench and then blast you to hell and back a few dozen times.
Robert Fulton was an amazingly inventive person who has been credited for inventing many devices, although perhaps his most famous invention was the steamship.