Lapita culture or the prehistoric Pacific ocean people have developed skills in building crafts to sail the seas.
Their greatest obstacle are the miles of water separating islands. In order to reach different land masses, they have develop skills to sail and navigate the seas.
The Louisiana Purchase significantly increased the size of the United States, which began the expansion of the country towards the West.<span> It also laid the groundwork for the Civil War as the new territories took sides in the heated slavery debate.
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The answer is the Mediterranean Sea
