each of the three fights $("$Challenge of the Ages," "Battle of the Ages," and "Fight of the Ages"$),$ as well as promotional epithets to characterize the two fighters $("$the Foreman Factor"$).$

Garner contacted George Foreman and his manager, who both reside in Texas, to sell the idea, and they arranged a meeting at Caesar's Palace in Las Vegas, Nevada. At some point in the negotiations, Foreman's manager signed a nondisclosure agreement prohibiting him from disclosing Garner's promotional concepts unless they signed a contract. Nevertheless, after negotiations between Garner and Foreman fell through, Foreman used Garner's $$Battle of the Ages" concept to promote a subsequent fight. Garner filed a lawsuit against Foreman and his manager in a federal district court in Illinois, alleging breach of contract. Using the information presented in the chapter, answer the following questions.

On what basis might the federal district court in Illinois exercise jurisdiction in this case?