Steam power was not new, but in the late 19th century, navies transitioned to steel (and armored) warships, while retaining the option for sails. The USS Chicago was among the first four such ships -- the so-called ABCD ships -- commissioned into the U.S. Navy. Cruiser Chicago was completed in 1886 and did not have a hull number; the numbers started a few years later.
The Chicago displaced 4,500 tons -- less than half of a current missile destroyer -- and was capable of 16 knots under ideal conditions. She was armed with four 8-inch guns, eight 6-inchers, two 5-inchers and had a few smaller guns as well. Chicago had a crew of 300 men.
Chicago was modernized later in the 1890s, losing most of her sails and her mainmast.