They convinced the colony of Pennsylvania to abolish slavery.
Emancipation Proclamation was issued hoping to abolish ALL slavery... Even though the 13th amendment eliminated alot of it.
Brazil
It would possibly depend upon your definition of "Serfdom", but I believe the 1917 revolution and subsequent overthrow of the Tsar effectively ended Serfdom in Russia by any definition. The pre-revolutionary Russian economy was heavily dependent on free labour, which was augmented by exiled prisoner labour. Earlier attempts at freeing the Serfs during the Romanov Dynasty ended in unpleasantness and the Serfs not being freed.
Mauritania made slavery a crime in 2007 and Niger made it a crime in 2003.
The earliest attempts to abolish slavery were the abolitionist movements that started in the 1750s. This proved unsuccessful because people did not want to give up their slaves and laughed at the idea. This continued to be unsuccessful because Thomas Jefferson, the owner of slaves himself, didn't wish to include provisions in the Constitution.
One of the early attempts to abolish slavery was the raid at Harper's Ferry. John Brown led a Provisional Army of 19 men to raid the government's weapons supplies and suppliers. John Brown believed that the raid would awaken the people's view on slavery and help abolish it. You can google some more information on him and the raid.
Quakers
The government decided to abolish the outdated law.
The term "abolitionist" was used to describe people who wan=ted to abolish slavery around the world.
abolish in french is abolir.
William Wilberforce worked to abolish the slave trade.
Abolitionists wanted to abolish slavery.
An antonym for abolish is "create".
The prefix for "abolish" is "a-" and the suffix is "-ish."
We must abolish slavery in the world.
The past tense of abolish is abolished.