Answer: B. He ended the mass execution of white Haitians by former slaves and affranchis.
Explanation:
Toussaint Louverture led thousands of slaves to freedom through the slave revolt in the French colony of Saint-Domingue (Haiti). By regaining control of the entire island, the military ruler changed the colony from a free society to a country run by former slaves. Among all the rulers who attempted to make the island into a federal state, he was the only one to succeed.
Prior to European contact, the Indigenous peoples of North America had numerous advanced civilizations. The Europeans brought diseases which destroyed much of the Native culture and killed up to 90% of the Native population.
It can't be A because the war took place in America and that is not the Brits home turf and can't be C because the natives almost definitely didn't like the brits. I'm not sure on D but B seems more likely over that.