Why did the term Underground Railroad became the name of this network of people that helped slaves escape?

The escape network was neither literally underground nor a railroad. (Actual underground railroads did not exist until 1863.) According to John Rankin, "It was so called because they who took passage on it disappeared from public view as really as if they had gone into the ground.

Explanation:

it is the code of hammurabi

the us constitution is a living document, meaning that it can be changed over time as the country changes.