The most important impetus for Greek overseas expansion was

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Greek overseas expansion was largely driven by social and political tensions caused by a growing population with inadequate land. This led to the colonization of new territories and the establishment of new trade networks. While precious metals and slavery were important factors, they were not the primary impetus for Greek overseas expansion. Use in defense against the Persians was also a factor, but this came later in the history of Greek expansion.

The Most Important Impetus for Greek Overseas Expansion Was