Book: Ireland 1845-1850 : the perfect holocaust and who kept it perfect 

Available free in various formats on Archive.org. The potato famine was a deliberate act by the English that killed 5 million Irish. When finally the English were "bought out of Ireland" the terms of the agreement were so far above Irish market price for land the loans for the land were not paid off until 1970.

Ireland 1845-1850 : the perfect holocaust and who kept it perfect : Fogarty, Chris, author : Free Download, Borrow, and Streaming : Internet Archive

Podcast interview about the book.  Stand alone it is quite educational with application to today.
https://archive.org/details/Ireland18451850ThePerfectHolocaustMyth20cEp108