Due to European influences…..
Despite what your liberal teacher taught you, America was a leader in abolition. Slavery was banned by the United States in 1865. However, that is not the where the story begins. Prior to that sovereign states and states within the republic banned slavery.
“At the Constitutional Convention many slavery issues were debated and for a time slavery was a major obstacle to passage of the new constitution. As a compromise the institution of slavery was acknowledged although never mentioned directly in the constitution. An example is the Fugitive Slave Clause. By 1789, five of the Northern states had policies that started to gradually abolish slavery: Pennsylvania (1780), New Hampshire and Massachusetts (1783), Connecticut and Rhode Island (1784). Vermont abolished slavery in 1777, while it was still independent. When it joined the United States as the 14th state in 1791, it was the first state to join that had no slavery. By 1804 all of the northern states had abolished slavery or had plans in place to gradually reduce it.[3] There were 11 free states and 11 slave states. Later came the civil war.”
simple.wikipedia.org
In 1820, slave trading became a capital offense with an amendment to the 1819 Act to Protect the Commerce of the United States and Punish the Crime of Piracy.
In 1807 Congress pass the Act Prohibiting the Importation of slaves.
The US also produced several prominent abolitionists, like Frederick Douglass, Harriet Tubman, and William Lloyd Garrison and Sojourner Truth.
The first organization dedicated to the abolition of slavery was a product of America. The “
Society for the Relief of Free Negroes Unlawfully Held in Bondage” was founded in 1775, in Philadelphia.
Even way back in the early colonial times, there was an abolition movement.
“The 1688 Germantown Quaker Petition against slavery was the first protest against African American slavery made by a religious body in the English colonies. It was drafted by Francis Daniel Pastorius, a young German attorney and three other Quakers living in Germantown, Pennsylvania (now part of Philadelphia) on behalf of the Germantown Meeting of the Religious Society of Friends to raise the issue of slavery with the Quaker Meeting which they attended.”
A brief overview of the 1688 Germantown Quaker Petition Against Slavery.
www.nps.gov