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.
The correct answer for this question is Triple Entente.
The seas surrounding Europe were controlled by Triple Entente. This is an informal treaty between Great Britain, France, and Russia. It was anchored on the Franco-Russian military alliance (1894), Anglo-French entente<span> (1904), and an Anglo-Russian </span>entente<span> (1907). </span>
