How did the, "Underground Railroad", contribute to the Civil War? (Brainliest answer pick every 20 minutes for now.)

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.  

continental currency was denominated in dollars from $​1⁄6 to $80, including many odd denominations in between.