Well i know it's not C or D so... it's either A or B. Hope this helps!!
Answer:
D. Abbasid dynasty
Explanation:
The city was founded in 762 as the capital of the ʿAbbāsid dynasty of caliphs, and for the next 500 years it was the most significant cultural centre of Arab and Islamic civilization and one of the greatest cities of the world. It was conquered by the Mongol leader Hülegü in 1258, after which its importance waned.
Ten years is equivalent to two terms which is the maximum amount of terms one person can serve as president.
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Loyal Creek - November 1861
Pea Ridge - March 1862
Fort Gibson (first time) - Summer 1862
Fort Gibson (second time) - April 1863
Honey Springs - July 1863