What two islands did the allies capture by island hopping

Iwo Jima, and Saipan

Explanation:

1.) Located 750 miles off the coast of Japan, the island of Iwo Jima had three airfields that could serve as a staging facility for a potential invasion of mainland Japan. American forces invaded the island on February 19, 1945, and the ensuing Battle of Iwo Jima lasted for five weeks.

2.)

On June 15, 1944, during the Pacific Campaign of World War II (1939-45), U.S. Marines stormed the beaches of the strategically significant Japanese island of Saipan, with a goal of gaining a crucial air base from which the U.S. could launch its new long-range B-29 bombers directly at Japan's home island

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