Answer:
Ondol
Explanation:
Ondol (or Gudeul in Korean) - the traditional Korean home heating system is a unique invention of ancient Korea.
People helped the slaves because they thought it was cruel what they were doing to the salves. So they created a thing called the Underground railroad where they would travel to a state that doesn't allow slave labor.
There were three types of British colonies: royal, proprietary, and self-governing. Each type had its own characteristics.
Answer:
Explanation:The Dred Scott Decision outraged abolitionists, who saw the Supreme Court's ruling as a way to stop debate about slavery in the territories