I am a native speaker of the English language with 6 years of Spanish schooling. After re-establishing a fluent Spanish speaking status what should be the next language to learn?

Latin seemed like it would be the most useful, since the goal is to learn as many languages as possible. As Latin is the base of many languages I plan to learn, it might be helpful to know the language that they are created from.

I'm looking for scientific studies that offer any insight as to what languages would be most efficient or objectively advantageous to learn given the two languages I already know.

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    Welcome to Language Learning! We don't encourage opinion-based questions like yours on our site because it can be difficult to select one objectively correct answer to the question. For that reason, I have voted to close your question as primarily opinion-based.
    – fi12
    Oct 17, 2017 at 2:03
  • @fi12 can you help reword the question ? there has to be a scientifically backed answer for the most productive order of language learning, that is what I am asking for. i will delete if you cant't determine the correct ay to ask such a question. Oct 17, 2017 at 2:13
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    @fi12 Thank you for the edit, well worded and is a much more concise representation of my question! Hopefully it receives a few useful responses! Oct 17, 2017 at 2:32
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    I'm afraid there is no scientific answer to your question; and indeed there cannot be. You're asking "languages would be most efficient or objectively advantageous to learn" -- these are entirely different criteria, and quite possibly exactly contrary to one another. For example, it may be most "efficient" to learn Portuguese or Italian, with your Spanish experience. But precisely because it's efficient, it's also the least beneficial, since you'll already be able to understand 50-75% of either of those languages.
    – Flimzy
    Oct 18, 2017 at 11:03
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    I would suggest that you narrow down the question to, e.g., which question would be easiest to learn next, i.e. for which language would previous knowledge English and Spanish bring the greatest benefits. Answers can then use arguments such as linguistic distance and skills transfer.
    – Tsundoku
    Oct 19, 2017 at 15:58