Which of the following was a primary cause of the Peloponnesian War?

While establishing trading relationships was a benefit of colonization, it was not the primary motivator for early Greek city-states. Their main concern was securing resources and land to support their growing populations rather than simply expanding trade networks. Trading partners could be established without the need for colonization.

This choice misrepresents the geographic and historical context of early Greek colonization. The Greeks were more focused on the Mediterranean and Black Sea regions for colonization rather than West Africa, where trade routes to gold were not a primary concern for them at that time. Their expansion was largely driven by local resource needs.

Although the Dorian invasion did contribute to migrations within Greece, it was not the primary reason for the widespread establishment of colonies. Many city-states sought to expand proactively due to resource scarcity and population pressures rather than merely reacting to invasions.