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<span>C. Early historians often used information from unverifiable sources.</span>
Answer: Complicated plz read
Explanation: So the south had the majority of the slaves during the civil war time. The south wanted to Keep slavery and the north wanted to abolish it. This war was considered one of the bloodiest battles in american history. Slavery was very essential back then becuase all those slaves were working hard with minimum to no pay on the farms. This means that the owners could sell the crops and get the moolah.(its all about the moolah right)? So there was a big gun fight and people died. But the mentality of the south states I guess were angry and fighting to keep the money(simply put). While the north thought that the south were being bullies:)
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"They developed an extensive system of paved stone roads" is the one factor among the following choices given in the question that a<span>llowed the Incas to use their military efficiently. The correct option among all the options that are given in the question is the first option. I hope the answer helped you.</span>