Iwo Jima - although not strictly a stepping stone it gave the US an airbase that was reasonably far forward and at the same time deprived the Japanese of an airbase allowing bombing raids on mainland Japan to proceed with less interference.
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Du Bois was a doctoral student at Friedrich-Wilhelms-Universität, was the first African American to receive a Ph. D. from Harvard University (in 1895), and was awarded an honorary doctoral degree from Humboldt-Universität in 1958.
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