Answer 1
Slavery has not been abolished, meaning ended. Most countries have made it illegal.
In the 1800s, those areas with slavery (or the semblance of it) were becoming more and more liberal, in line with the changing of the world at the time. Because of the rise in education and political awareness as well as the growing realization that people of different color or ethnicity were just as human as anyone else - in several countries, this was also due to what was best said in the words of Alexander II of Russia, paraphrased as "we must abolish it from the top down before it removes itself from the bottom up".
Thus, slavery was abolished in many areas. This was formalized in 1948 with Article 4 of the United Nations' Universal Declaration of Human Rights, and almost every country in the world has made slavery illegal in accordance with it.
Answer 2
Why a certain country abolished slavery depends entirely on the country in question. However, it was usually based on one or both of the following factors:
(1) The country recognized slavery's moral incorrectness
(2) The country faced economic or political consequences in the international community if it did not abolish slavery, especially when key trading partners or allies had already emancipated their slaves.
The thirteenth amendment abolished slavery.
Amendment 13 abolished slavery.
The 13th Amendment officially abolished slavery.
slavery was abolished in 1834
the 13th amendment abolished slavery
Slavery was abolished by the thirteenth amendment.to abolish slavery
It was the Thirteenth Amendment which abolished slavery.
When slavery was abolished, slaves were released from their owners, making them "free".
Mexico abolished slavery
Slavery has not been abolished though some countries have made it illegal.
I wasn't born when slavery was abolished, so I didn't feel anything about it.
It abolished slavery