Slavery and serfdom were abolished in the 1860s in the countries of:
- B. The United States and Russia
According to the given question, we are asked to state the countries in which slavery and serfdom were abolished in the 1860s.
As a result of this, we can see that slavery had to do with the buying and selling of humans mainly for the purposes of working in plantations and other menial jobs, without pay and this, along with serfdom was abolished in the countries of America and Russia in the 1860s.
Therefore, the correct answer is option B
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