Because the North won - having issued the Emacipation Proclamation (chiefly to keep out the British, rather than for pure Abolitionist sentiment), resulting in the liberation of many slaves by the Union armies. It turned out to be a wartime measure that could not have been rescinded afterwards.
The common misconception is that it ended (in the US) when Abraham Lincoln Signed and approved the emancipation Proclamation.
This is, however, wrong. The Emancipation Proclamation only officially ended slavery for slaves in "rebellious" states... i.e. just those that denied that the government of which Lincoln was president had any power over them.
It did have one immediate effect: the Union Army stopped treating captured slaves as "contraband enemy property" and began immediately freeing them. However, slavery didn't officially end in the US as a whole until December 6, 1865, when Georgia ratified the 13th Amendment pushing it over the requirement of ratification by at least 3/4 of the states and making it a part of the US Constitution.
It also might be noted that while the 13th amendment freed slaves in general, it expressly permits involuntary servitude as punishment for crimes. Slavery in that sense is technically still constitutional under US law, though it's since been abolished by all states individually with the last being Alabama in 1927.
It is still endemic in many parts of the world.
Slavery is still very much with us.
The Slavery Abolition Act 1833 us what helped end the slave trade.
Slavery was ended in the US at the end of the Civil War. it was ended by the emancipation proclamation.
after the civil war
== == Slavery in the United States was banned in 1862.Slavery came to an end in 1863.
in 1865 after the Civil War
To end slavery in the US
The end of slavery.
The Emaciation Proclamation began the end of slavery but it was formally outlawed by the Thirteenth Amendment to the US Constitution.
Various abolitionist organizations were formed to fight the expansion of slavery in the US. Leaders such as William Garrison and Harriet Stowe were leaders for the fight to not only stop the spread of slavery but to abolish it in the US.The other, more formal organization was the Republican Party. Its goal was to end slavery in the US.
slavery ended in 1750 - 1800 butt slavery is still around maybe. but just not in the U.S.
1862 emancipation proclamation
Slavery was abolished by an amendment to the Bill of Rights section of the US Constitution. The 13th Amendment abolished slavery in the United States.
The 13th amendment (passed in 1865) prohibited the involuntary servitude (slavery) in the US.
Slavery was brought to an end in the United States because the government outlawed it, and also because the north had won the war.
Probably something bad
The 13th Amendment in 1865.