Later civilizations developed basic algebra and geometry by building on the number system first created by the "<span>b. Sumerians," since the Sumerians were some of the first people to develop what would later become advanced mathematics. </span>
It was the CSS Virginia that was the Confederacy's first ironclad vessel, built on the hull of the Union ship, USS Merrimack, although it turned out to not be terribly useful in wartime.
