It means girl and women slaves who are escaping to Canada
Harriet Tubman
Slaves were important for "economic development" and aristocrisy
harriet tubman was an amazing wonderful and brave woman
gained a deeper awareness of how much slavery was a violation of human rights and values.
There were many places in Canada for black slaves. Such as Buxton.
There were no northern slaves or slave owners. That is why slaves went north when escaping with the Underground Railroad.
underground railroad
The Seminoles.
station masters
The Underground Railroad
The cause of the slaves' discovery by the farmer is the dogbarking at them. What is an effect of the slaves' discovery?
The term you are looking for is Manumission- the owner of a slave might free the slaves that he owned.
"a friend of a friend"
Harriet Tubman
Slaves relied on word of mouth and secret signals to identify safe houses, such as a specific lantern light or a hidden symbol. Underground Railroad conductors also used codes and passwords to communicate the location of safe houses to escaping slaves. Additionally, trusted individuals known as "conductors" would guide the slaves to safety.
This was a system of stops for slaves escaping North out of slavery. It was not a real railroad, but a means to hide slaves and move them North.