Answer:
- Slavery started in North America .
- The civil war began.
- Slaves where freed by presidential proclamation.
- Slavery was outlawed in a Constitutional Amendment.
Step-by-step explanation:
In the 17th century, the colonists in North America brought along with them some enslaved people. To increase crop yields they turned more and more to slavery but after the American Revolution, most states in the North denounced slavery.
This led to tension with the South where slavery was legal and rampant. Tensions escalated to the American Civil War during which President Lincoln freed the slaves in Southern States via the Emancipation Proclamation.
After the Civil War, Slavery was outlawed with the 13the Amendment to the Constitution.