colonialism is practice of acquiring full or partial political control over another country, occupying it with settlers, and exploiting it economically.
The slave trade has evolved and has meant that native Africans were taken and sold to plantation owners for them to have to work on the plantation. Plantation owners had power over the slaves and oppressed their human rights, by taking them from where they live onto a plantation to work for nothing. Plantation owners also had to pay for the slaves, objectifying them and treating them as if they were an object.