John Ericsson
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John Ericsson (1803-1889) was a Swedish-American inventor and engineer. During the Civil War, he designed and built the Moniter, America's first ironclad vessel. He was born in Sweeden in 1803. In 1839, he immigrated to the United States to work on his idea of screw propellers. He is created with creating almost 2,000 inventions in his lifetime.