The states that gained statehood are Colorado, Arizona, North Dakota, South Dakota, and Montana.
The Bessemer process was the first inexpensive industrial process for the mass-production of steel from molten pig iron. Independently discovered in 1851 by William Kelly, the process had also been used outside of Europe for hundreds of years, but not on an industrial scale.
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The U.S. entered World War because Germany embarked on a deadly gamble. Germany sank many American merchant ships around the British Isles which prompted the American entry into the war.
