Answer:
The underground railroad
Explanation:
The 'underground railroad' was known as such due to the slaves using it to escape and the people helping them to escape using secret codes that were commonly associated with railroads.
(Ex: 'station masters' = people who would hide slaves)
D- they canot live very long
details or trivia is the best I could come up with. There are really none. Hope this helps!
D. Henry Ford adapted the assembly line, an innovation in factory production, to produce cars.
