On 10 January 49 BC, leading one legion, the Legio XIII Gemina, General Julius Caesar crossed<span> the </span>Rubicon<span> River, the boundary between the Cisalpine Gaul province to the north and Italy proper to the south, a legally-proscribed action forbidden to any army-leading general.
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A they were based on finding ways to use available water souces
The correct answer is B - poverty.