Last week I searched these three words, which are Slavery, Abolition of Slavery and the slave trade, on Google Ngram Viewer to see when have they most appeared in books, magazines, etc.
The results weren’t strange as if you look at some information about history you realize why there’s a maximum in that place and not in another.
Firstly, we can see that talking about slavery, there’s a huge rise between the years 1830 and 1866. This is because the first country that abolished slavery was Great Britain in 1833 and since that moment that subject became very popular so that everyone wanted to know about, even if it was because they were in favor or against its abolition. We can also see that there’s a maximum between years 1863 and 1865 and after that it starts decreasing, and there’s a simple explanation for it. In 1865, the USA passed a bill abolishing slavery and that meant that it had almost disappeared. The same happens when we look at abolition of slavery. It appears a maximum between years 1860 and 1865.
Finally, we have that when it comes to the slave trade, there’s a maximum between the years 1815 and 1819. This is because between those years many campaigns started against slavery and the slave trade, so people began to fight for negroes’ freedom and some states passed the first bills abolishing slavery.