The Mariana Islands are an arc-shaped archipelago made up of 15 volcanic mountains in the Pacific Ocean. Spain ceded the largest island in the chain to the U.S. in 1898, and it today remains a part of the United States. What is this largest island?

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1. The Mariana Islands are an arc-shaped archipelago made up of 15 volcanic mountains in the Pacific Ocean. Spain ceded the largest island in the chain to the U.S. in 1898, and it today remains a part of the United States. What is this largest island?