In a federal case from Wisconsin where a surety company that issued a payment bond for the 31st Street Harbor project in Chicago invoked the ancient remedy of quia timet (“because he fears”) after one of the principals (a Wisconsin construction company) allegedly failed to pay subcontractors, the surety argued for application of Illinois law; the contractor relied on Wisconsin precedent; and as part of its choice-of-law analysis the 7th U.S. Circuit Court of Appeals explained that several factors “weigh …