I don't know if I would consider the early colonies as "the founding" of the modern western powers. If you look at the founding of the USA it absolutely is accurate, many founding fathers were slave owners. Slavery also had influence within Canadian territories until it was outlawed. Both waged genocidal war on First Nations and Native Americans from the beginning.
The USA continued to perpetuate slavery and compromise with slavers for decades/centuries to come, after Canada and Britain had long since moved on.
The USA continued to perpetuate slavery and compromise with slavers for decades/centuries to come, after Canada and Britain had long since moved on.