text: During a conflict over this resource, the Numancia became the first ironclad ship to circumnavigate theworld.
full_question: During a conflict over this resource, the Numancia became the first ironclad ship to circumnavigate theworld. This resource was mined on Navassa Island, which is now disputed by the United States and Haiti.Isabella II warred with former Spanish colonies in the Chincha Islands, a center for mining this resource. An1856 act passed by James Buchanan allowed American citizens to seize islands abundant in this resource,including the Swan Islands now owned by Honduras. Peru heavily exported this nitrogen-rich resource in thenineteenth century. For 10 points, name this fertilizer produced from the droppings of bats and seabirds. 
first_sentence: During a conflict over this resource, the Numancia became the first ironclad ship to circumnavigate theworld.
raw_answer: guano [prompt on excrement or equivalents] 