On this day in 330, Constantine the Great dedicated Byzantium (Constantinople; now Istanbul) as the new capital of the Eastern Roman Empire, an act that helped transform it into a leading city of the world.
| 1943: | | U.S. troops invaded Attu, one of the Aleutian Islands captured by the Japanese in 1942. |
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| 1918: | | | American theoretical physicist Richard P. Feynman was born in New York City. |
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| 1910: | | | Glacier National Park was established in the Rocky Mountain wilderness of northwestern Montana. |
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| 1888: | | | American composer Irving Berlin, who played a leading role in the evolution of the popular song from the early ragtime and jazz eras through the golden age of musicals, was born in Russia. |
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| 1885: | | American jazz cornetist King Oliver was born in Abend, Louisiana. |
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| 1846: | | | U.S. President James K. Polk asked Congress to declare war on Mexico. |
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