Answer:
the underground railroad was and still is a exit from slavery in some states for thousands of slaves.
the underground railroad could have been a particular part or feature of the civil war.
The Underground Railroad give something better then money in order to help achieve to the Civil War as a dramatic protest action against slavery.
having been in existence for a long time and therefore recognized and generally accepted in the early 1800's, the Underground Railroad helped thousands of slaves to escape bondage.
