B. Sea life. This is because all of the other three options are very publicized, but sea life is not.
The answer is:
The Louisiana Territory belonged to Spain before it was transferred to Napoleon in 1802.
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The correct answer is “avoiding European affairs”
Even when Europe was moving closer and closer to war in the 1930s, the US Congress passed the Neutrality Acts that demanded a growth in isolationism and non-interventionism. The isolationists defended that the WWI was a failure and the safety of the US was more important than any war in Europe.