Final answer:
The idea about colonialism that is most clearly expressed in this excerpt is that the actions of the colonists are cruelly harming human beings for no reason.
Step-by-step explanation:
The idea about colonialism that is most clearly expressed in this excerpt is that the actions of the colonists are cruelly harming human beings for no reason.
The excerpt describes how European colonial governments engaged in brutal and violent actions against the local peoples in Africa. They enforced enslavement, stole land, confined people to reservations, and forced them to work on European plantations. These actions clearly demonstrate the cruelty and harm inflicted upon the indigenous people by the colonists.