The justification to the European "scramble to Africa" is that they could. Claims were also starting points for negotiations among European countries based on relative power and perhaps give and take in other domains or geographical areas.
Historically, and to a point up to this day, territorial claims are a power play. Either you're powerful enough to enforce them (through possession, defence, threats) or you are not. And the justification to seeking territory is of course to increase power and resources.
Historically, and to a point up to this day, territorial claims are a power play. Either you're powerful enough to enforce them (through possession, defence, threats) or you are not. And the justification to seeking territory is of course to increase power and resources.