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In page Colonialism:

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Economic expansion, sometimes described as the colonial surplus, has accompanied imperial expansion since ancient times.[citation needed] Greek trade networks spread throughout the Mediterranean region while Roman trade expanded with the primary goal of directing tribute from the colonised areas towards the Roman metropole. According to Strabo, by the time of emperor Augustus, up to 120 Roman ships would set sail every year from Myos Hormos in Roman Egypt to India.[1] With the development of trade routes under the Ottoman Empire,