Based on the clue 'at its mouth the gulf of sidra stretches 280 miles...', what is the answer?

Based on the clue 'at its greatest extent the persian empire stretche...', what is the answer? Based on the clue 'at its height it was known as the empire on which ...', what is the answer? What is associated with: at its inception in 1946 the cdc fought this mosquito borne disease that was prevalent in the… What is associated with: at its independence in 1957 the gold coast took the name of this medieval west african empire? Based on the clue 'at its narrowest point this strait separates europ...', what is the answer? Based on the clue 'at its north end the dead sea receives this river', what is the answer? Based on the clue 'at its northern end this colorful sea branches int...', what is the answer? Based on the clue 'at its opening this nyc building was the largest m...', what is the answer?