A)<span>They allowed the Romans to focus more on expanding into the Western Mediterranean.
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<span>The bitterness left behind in parts of Europe by the Treaty of Versailles contributed to the rise of D. totalitarianism.
Totalitarianism has to do with a form of dictatorial rule, seen in the rule of Hitler and Mussolini. They exploited this emotion of bitterness and eventually led to the World War II, where their rule was authoritarian. </span><span>
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I would say that the most likely reason is <span>a high birth rate. There's usually a higher birth rate in less developed countries. The higher the birth rate, the more young children, the smaller number of </span><span>an ageing population. </span>