Thomas Clements brought an action to recover damages for breach of warranty against defendant Signa Corporation. (A warranty is an obligation that the seller of goods assumes with respect to the quality of the goods sold.) Clements had purchased a motorboat from Barney’s Sporting Goods, an Illinois corporation. The boat was manufactured by Signa Corporation, an Indiana corporation with its principal place of business in Decatur, Indiana. Signa has no office in Illinois and no agent authorized to do business on its behalf within Illinois. Clements saw Signa’s boats on display at the Chicago Boat Show. In addition, literature on Signa’s boats was distributed at the Chicago Boat Show. Several boating magazines, delivered to Clements in Illinois, contained advertisements for Signa’s boats. Clements also had seen Signa’s boats on display at Barney’s Sporting Goods Store in Palatine, Illinois, where he eventually purchased the boat. A written warranty issued by Signa was delivered to Clements in Illinois. Although Signa was served with a summons, it failed to enter an appearance in this case. The court entered a default order and, subsequently, a judgment of $6,220 against Signa. Signa appealed. Decision?