The major challenges to historical research revolve around the problems of sources, knowledge, explanation, objectivity, choice of subject, and the peculiar problems of contemporary history. Sources The problem of sources is a serious challenge to the historian in the task of reconstructing the past.
Answer: They created a strong, unified Muslim kingdom with Cordoba as its capital.
Explanation:The revival of the Umayyad Caliphate in Al-Andalus (what would become modern Spain) was called the Caliphate of Córdoba, which lasted until 1031. The period was characterized by an expansion of trade and culture, and saw the construction of masterpieces of al-Andalus architecture.
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At its heart, <span>Economics is the study of how people make choices given limited resources. This often breaks down to a study of money, but the discipline itself is more far-reaching than that. </span>
