Answer:
The capture of Constantinople was important for the turkish because the city was very fortified and it provided an opportunity for the sultan Mehmed to test his military skills against one of the most powerful empires around in his time.
Explanation:
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The four main causes were: militarism, alliances, imperialism and nationalism - or as an acronym, M-A-I-N (this made it much easier for me to remember the causes)
I'm afraid I couldn't give you a complete answer, or the answer that you're looking for, for this question regarding the Native-born Americans in 1860's since there is no map provided with this question. Try re-posting this question with the map on it.
