Final answer:Alfred Thayer Mahan argued for an end to isolationism due to the United States' expanding economy and the perceived moral duty of the country. He believed that a strong navy and a more active role in international affairs were necessary for the nation's growth and security.Explanation:Alfred Thayer Mahan was an American naval officer and historian who argued in favor of the United States ending its policy of isolationism in the late 19th century. Mahan believed that a strong navy was essential for the growth and security of a nation, and he felt that the United States' expanding economy necessitated a departure from its isolationist stance.One of the key factors influencing Mahan's argument was the United States' economic expansion. As the country's economy grew, he believed it required access to foreign markets and resources, which could only be secured through a more active role in international affairs.Mahan also believed that isolationism conflicted with the Christian duty to spread democracy and promote civilization. He argued that the United States had a moral obligation to fulfill its role as a global power and contribute to the betterment of humanity.Learn more about Alfred Thayer Mahan's arguments against isolationism here:brainly.com/question/2700669...

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