PS161M John Ericsson invented a Union ironclad warship. It was made of iron. It had a steam engine. It had a rotating turret with two guns inside so it can shoot in any direction. It was called the USS Monitor.

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John Ericsson invented a Union ironclad warship. It was made of iron. It had a steam engine. It had a rotating turret with two guns inside so it can shoot in any direction. It was called the USS Monitor.

4 of 36