There wasn't a country prior to 1900 where >97% of the population wasn't dirt poor.
The American South - AFAIK - is unique in the percentage of families that 1) had wealth, and 2) had slaves.
Most of those people were independently wealthy immigrants, or descendents of them.
Beside the American South - you're not going to find any group that can be considered a majority that directly benefited from slavery.
Finland indirectly benefited from slavery - at the very least - by not DIRECTLY being enslaved in the slave trade. Sure, maybe not as indirect as New York City or London, but there were benefits...
The American South - AFAIK - is unique in the percentage of families that 1) had wealth, and 2) had slaves.
Most of those people were independently wealthy immigrants, or descendents of them.
Beside the American South - you're not going to find any group that can be considered a majority that directly benefited from slavery.
Finland indirectly benefited from slavery - at the very least - by not DIRECTLY being enslaved in the slave trade. Sure, maybe not as indirect as New York City or London, but there were benefits...