based on the maps which two african countries show the greatest changes in their borders from imperialist rule to present-day boundaries

Except common history

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.

Where is the map from the question?

Hey there! something that is given up as the result of a choice is referred to as  a decisionwhen you have a choices that are being refereed, this would mean that this would be a decision.~jurgen