The three Gs God Gold and Glory
Because he wanted to have a monopoly over the African trade. The company and the king split the profits in half, and when the business turned into slave trade the money kept coming in so everyone started getting richer and richer. The monopoly ended when the glorious revolution happened a couple of years later.
He thought slavery would be decided by the civil war
To keep the slaves from running off and knowing how to do the basic things everyone would need to know.